Can I still use Flash after EOL?
After the EOL Date, Adobe will not issue Flash Player updates or security patches. Adobe strongly recommends immediately uninstalling Flash Player. To help secure your system, Adobe blocked Flash content from running in Flash Player beginning January 12, 2021.
How do I get around Flash Player EOL?
That being said, there are ways to acquire a past versions of Flash Player, immune to the EOL killswitch. An out-of-the-box solution is to install Waterfox, a modern fork of Firefox which also supports a lot of legacy features including Flash Player.