Background services (especially old Adobe IPC Broker services or third-party security software) can corrupt the installer mid-check.
If all else fails, you can bypass the installer completely by manually extracting the Photoshop files. This works because the “damaged” error often only affects the installer GUI, not the core files. adobe damaged installer fix photoshop windows 7 top
Here is the fix that worked for me (and seems to be the top solution for everyone else): Here is the fix that worked for me
(like Exit Code 7 or Error 1), or just the general "damaged" message? Error | Installer is damaged - Adobe Help Center Start with KB2670838 and the Cleaner Tool –
The error on Windows 7 is rarely a true corruption. It’s almost always a missing system update, permission issue, or leftover cache. Start with KB2670838 and the Cleaner Tool – these two resolve over 80% of cases.