Not able to install Adaptive theme in Drupal 10

As a workaround, you can edit the subtheme's .info.yml file to include Drupal core version 10. You need to prepend the name of the subtheme in front of .info.yml to get the file name right.

core_version_requirement: '^8 || ^9 || ^10'

In at_tool version 2.0.3, I found that line 90 of at_tool/at_theme_generator/src/Theme/ThemeGeneratorTypes.php
seems to be the problem:

$info['core_version_requirement'] = '^8 || ^9';

This seems to be where the core_version_requirement is originating. Changing it to

$info['core_version_requirement'] = '^8 || ^9 || ^10';

would seem to fix this. I have NOT tested this - I just found it in the code.

This should be fixed now.