Feature request: the ability to install old versions

[KVAnton-WEB]

add setting - do not hide the installation option, even if updated to the latest version (for example, if the new version does not work correctly)

Forced $upgradeAvailable = true;

[BobRay]

This is from the docs:

'For testing purposes (and to fix possible corrupted or missing MODX files), you can "upgrade" MODX to the version you currently have by changing the settings_version System Setting to an earlier version.'

This is a pretty convenient fix for the rare occasion when you need it, imo.