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Upgrade from 2.3.5p1 to 2.3.7 – Why does it fail?

I am trying to upgrade from 2.3.5p1 to 2.3.7 using Composer version 1.9.1, on a computer with PHP 7.3.

First i run: php composer.phar require magento/product-community-edition 2.3.7 –no-update

I get:

Warning from https://repo.packagist.org: You are using an outdated version of Composer. Composer 2 is now available and you should upgrade. See https://getcomposer.org/2
Magento Open Source 2.3.7 is trying to add require:magento/composer-root-update-plugin=~1.1 but it is instead ~1.0 in this installation and will not be changed.  Re-run using --use-default-magento-values or --interactive-magento-conflicts to override with Magento values.
Magento Open Source 2.3.7 is trying to change the existing order of the require section.
Local order:
   [
      magento/composer-root-update-plugin,
      magento/product-community-edition
   ]
Magento Open Source 2.3.7 order:
   [
      magento/product-community-edition,
      magento/composer-root-update-plugin
   ] but it will not be changed. Re-run using --use-default-magento-values or --interactive-magento-conflicts to override with the Magento order.
Updating composer.json for Magento Open Source 2.3.7 ...
./composer.json has been updated

And then i run: export COMPOSER_MEMORY_LIMIT=99999999999 && php -d memory_limit=-1 composer.phar update

I am getting the following errors:

Loading composer repositories with package information
Warning from https://repo.packagist.org: You are using an outdated version of Composer. Composer 2 is now available and you should upgrade. See https://getcomposer.org/2
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - magento/framework 101.0.0 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.1 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.2 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.3 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.4 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.5 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.6 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.7 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 102.0.0 requires php ~7.1.3||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 102.0.1 requires php ~7.1.3||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.8 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 102.0.2 requires php ~7.1.3||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.9 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.10 requires php ~7.0.13|~7.1.0|~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 102.0.2-p2 requires php ~7.1.3||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.11 requires php ~7.0.13||~7.1.0||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.0 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.1 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.2 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.3 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.4 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.5 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.6 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.7 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 102.0.0 requires php ~7.1.3||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 102.0.1 requires php ~7.1.3||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.8 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 102.0.2 requires php ~7.1.3||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.9 requires php ~7.0.13|~7.1.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.10 requires php ~7.0.13|~7.1.0|~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 102.0.2-p2 requires php ~7.1.3||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - magento/framework 101.0.11 requires php ~7.0.13||~7.1.0||~7.2.0 -> your PHP version (7.3.26) does not satisfy that requirement.
    - Conclusion: don't install magento/product-community-edition 2.3.7
    - magento/framework 102.0.6-p1 requires laminas/laminas-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1].
    - magento/framework 102.0.6 requires laminas/laminas-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1].
    - magento/framework 102.0.5-p2 requires laminas/laminas-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1].
    - magento/framework 102.0.4-p2 requires zendframework/zend-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1], zendframework/zend-code[3.3.0, 3.3.1, 3.3.2].
    - magento/framework 102.0.5 requires laminas/laminas-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1].
    - magento/framework 102.0.3-p1 requires zendframework/zend-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1], zendframework/zend-code[3.3.0, 3.3.1, 3.3.2].
    - magento/framework 102.0.4 requires zendframework/zend-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1], zendframework/zend-code[3.3.0, 3.3.1, 3.3.2].
    - magento/framework 102.0.3 requires zendframework/zend-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1], zendframework/zend-code[3.3.0, 3.3.1, 3.3.2].
    - magento/framework 102.0.6-p1 requires laminas/laminas-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1].
    - magento/framework 102.0.6 requires laminas/laminas-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1].
    - magento/framework 102.0.5-p2 requires laminas/laminas-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1].
    - magento/framework 102.0.4-p2 requires zendframework/zend-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1], zendframework/zend-code[3.3.0, 3.3.1, 3.3.2].
    - magento/framework 102.0.5 requires laminas/laminas-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1].
    - magento/framework 102.0.3-p1 requires zendframework/zend-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1], zendframework/zend-code[3.3.0, 3.3.1, 3.3.2].
    - magento/framework 102.0.4 requires zendframework/zend-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1], zendframework/zend-code[3.3.0, 3.3.1, 3.3.2].
    - magento/framework 102.0.3 requires zendframework/zend-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1], zendframework/zend-code[3.3.0, 3.3.1, 3.3.2].
    - magento/framework 102.0.5 requires laminas/laminas-code ~3.3.0 -> satisfiable by laminas/laminas-code[3.3.2, 3.3.0, 3.3.1].
    - Can only install one of: laminas/laminas-code[3.4.1, 3.3.0].
    - Can only install one of: laminas/laminas-code[3.4.1, 3.3.1].
    - Can only install one of: laminas/laminas-code[3.4.1, 3.3.2].
    - Can only install one of: laminas/laminas-code[3.4.1, 3.3.2].
    - don't install zendframework/zend-code 3.3.0|don't install laminas/laminas-code 3.4.1
    - don't install zendframework/zend-code 3.3.1|don't install laminas/laminas-code 3.4.1
    - don't install zendframework/zend-code 3.3.2|don't install laminas/laminas-code 3.4.1
    - magento/product-community-edition 2.3.7 requires laminas/laminas-code ~3.4.1 -> satisfiable by laminas/laminas-code[3.4.1].
    - Installation request for magento/product-community-edition 2.3.7 -> satisfiable by magento/product-community-edition[2.3.7].
    - fooman/pdfcustomiser-m2 8.5.4 requires magento/framework 101.0.0 - 101.0.11 | >=102.0.0 < 102.0.7 | >=103.0.0 < 103.0.2 -> satisfiable by magento/framework[102.0.5, 103.0.1-p1, 102.0.6-p1, 103.0.1, 102.0.6, 103.0.0-p1, 103.0.0, 102.0.5-p2, 102.0.4-p2, 102.0.3-p1, 102.0.4, 101.0.11, 102.0.2-p2, 101.0.10, 102.0.3, 101.0.9, 102.0.2, 101.0.8, 102.0.1, 102.0.0, 101.0.7, 101.0.6, 101.0.5, 101.0.4, 101.0.3, 101.0.2, 101.0.1, 101.0.0].
    - fooman/pdfcustomiser-m2 8.5.4 requires magento/framework 101.0.0 - 101.0.11 | >=102.0.0 < 102.0.7 | >=103.0.0 < 103.0.2 -> satisfiable by magento/framework[102.0.5, 103.0.1-p1, 102.0.6-p1, 103.0.1, 102.0.6, 103.0.0-p1, 103.0.0, 102.0.5-p2, 102.0.4-p2, 102.0.3-p1, 102.0.4, 101.0.11, 102.0.2-p2, 101.0.10, 102.0.3, 101.0.9, 102.0.2, 101.0.8, 102.0.1, 102.0.0, 101.0.7, 101.0.6, 101.0.5, 101.0.4, 101.0.3, 101.0.2, 101.0.1, 101.0.0].
    - fooman/pdfcustomiser-m2 8.5.4 requires magento/framework 101.0.0 - 101.0.11 | >=102.0.0 < 102.0.7 | >=103.0.0 < 103.0.2 -> satisfiable by magento/framework[102.0.5, 103.0.1-p1, 102.0.6-p1, 103.0.1, 102.0.6, 103.0.0-p1, 103.0.0, 102.0.5-p2, 102.0.4-p2, 102.0.3-p1, 102.0.4, 101.0.11, 102.0.2-p2, 101.0.10, 102.0.3, 101.0.9, 102.0.2, 101.0.8, 102.0.1, 102.0.0, 101.0.7, 101.0.6, 101.0.5, 101.0.4, 101.0.3, 101.0.2, 101.0.1, 101.0.0].
    - Can only install one of: magento/framework[102.0.7, 103.0.1-p1].
    - Can only install one of: magento/framework[102.0.7, 103.0.1].
    - Can only install one of: magento/framework[102.0.7, 103.0.0-p1].
    - Can only install one of: magento/framework[102.0.7, 103.0.0].
    - Can only install one of: magento/framework[103.0.1-p1, 102.0.7].
    - Can only install one of: magento/framework[103.0.1, 102.0.7].
    - Can only install one of: magento/framework[103.0.0-p1, 102.0.7].
    - Can only install one of: magento/framework[103.0.0, 102.0.7].
    - magento/product-community-edition 2.3.7 requires magento/framework 102.0.7 -> satisfiable by magento/framework[102.0.7].
    - Conclusion: don't install magento/framework 102.0.7
    - Installation request for fooman/pdfcustomiser-m2 8.5.4 -> satisfiable by fooman/pdfcustomiser-m2[8.5.4].

What should I do to overcome these errors?

The solution to upgrade was to remove 3 lines for the Fooman extensions from the composer.json and run update with –ignore-platform-reqs as suggested by jiheison.