New Adobe Flash Player WHQL 18.104.22.168 is available. See first post for more details. :-)
Unless you know something about the PPAPI version that I don't (not using any Chromium-based browsers on Vista myself), I think you must be lacking a Recommended update from 7 years ago. I suggest that you go to Installed Updates and type KB2763674 in the Search field. If it cannot be found, go to Microsoft Update Catalog and download it. It probably requires a restart. I think you would then be able to install Flash Player and various other software that isn't very old. Of course from a security standpoint, uninstalling Flash Player is an even better idea than updating it. This is Flash Player's last year as a supported product anyway, but there may still be some websites that require it.Since the latest ADF updates aren't applicable to Vista, I wonder if they should still be identified in this forum? Just a thought.