If you are upgrading from 26.4.1 and still have issues, it is recommended to delete the preferences folder.
If files are saving too slowly, try turning off "Include Linked Files" in the Save dialog. If you are running into specific issues, Download File Adobe_Illustrator_2022_v26.5.sane...
Always use the official Adobe Creative Cloud Desktop App to install software to avoid malware. 📥 How to Download v26.5 the Creative Cloud Desktop application. Find Illustrator in your app list. Click the three dots (...) next to "Open" or "Update". Select "Other versions" . Locate v26.5 and click Install. If you are upgrading from 26