Have downloaded flash player to MAC OS Catalina v.10.15.6, the program can find in MAC, but cannot use, can anyone know what is the problem ?
Probably, you chose to download Safari 14. One of the exciting new features listed by Apple is that it will stop Flash Player from running. Once again, Apple are ahead of the rest! (For everyone else, Flash Player will stop working at the end of the year).
So - what cn you do ?
Choices, if you don't think Apple's choice is cool...
1. Stay ahead of the curve and give up on Flash. Everyone will have to give up in 3 months, why fight it?
2. Install another browser to keep going these few months.
3. Wipe your Mac and go back to an older system.
You can use one of the other supported browsers: Google Chrome (embeds Flash Player so no need to download it separately), Firefox, or Opera.