Today after inadvertently deleting all the older versions of Illustrator while updating to Illustrator 2022, I found out I can't revert it and reinstall let's say Illustrator 2019 which I erroneosly deleted. For unknown reason Adobe CC app doens't allow to reinstall this version. But how can I do it?
I do not know how far back this process will go, but try... Direct Download Links https://prodesigntools.com/tag/ddl MAY help -you MUST do what it says in Note: Very Important Instructions -https://prodesigntools.com/adobe-cc-2015-direct-download-links.html#download-instructions -the prodesign links go directly to Adobe's file server, so this process will --only work until Adobe completely removes the old version(s) from the server . IF/When you do have a download, be sure to copy it to AT LEAST one external device -since Adobe does sometimes remove old versions from the server -a usb flash drive or external hard drive, or write to a DVD
For unknown reason Adobe CC app doens't allow to reinstall this version.
For some time, Adobe has had a policy of only offering the current version, and the major version immediately prior to the current version, via the Creative Cloud desktop app. They call this their "N-1" policy.
If you want earlier versions, you have to obtain them from other reputable non-Adobe sources. Best practice is to uncheck the Auto-update option in Preferences and, when you manually update your apps, decline to uninstall previous versions when prompted.