Patches Adobe Flash Player timebomb on Windows. In Adobe Flash Player versions newer than 32.0.0.344 they added a "Timebomb" for the EOL. the player would refuse to run any custom flash content after 12/01/2021,
When looking for a solution for the problem, I found this analysis of the timebomb: https://gist.github.com/KuromeSan/56d8b724c0696b54f9f81994ae3591d1
Unfortunately, I only found patchers for the timebomb that were written in .NET. Now I definitely don't want to pollute my system with .NET Framework and the patcher above didn't even work properly on Windows XP. So I decided to write my own little patcher that is just a tiny executable without any dependencies. It is based on the work mentioned above.
Depending on whether you are on x86 or x64 System, download flashpatch_x86.exe or flashpatch_x64.exe from Releases-page. If you just want to look in the default locations and patch Flash installation there, simply run the .exe If you want to scan a certain directory or patch a specifig file, specify it as a commandline parameter.
On Windows 7 and below, just download and install it from the sites mentioned here On Windows 10, you need to download the latest Flash player from KB4580325 and reinstall its contents. For this, download reinst_flash_w10.cmd to the same directory as the flashpatch_???.exe files and run it, it downloads mentioned updated flash version and copies it to System directory again.