Change PHP version doesn't work

[anon46092769]

Welcome to the forum.
Currently, all accounts use PHP 7.4.8, and that version cannot be changed.
We used to have PHP 5.x, but on September the 5.x versions were removed along with the Change PHP Version page.

PHP 5.x versions will be removed soon

As of the 2nd of September, all PHP 5.x versions have been removed from free hosting, and all sites have been upgraded to PHP 7.4. The PHP version selector has also been removed (because there are no other PHP versions to choose from). PHP 8 is next on the roadmap regarding PHP versions, which will replace PHP 7.4 when that happens.