You should NOT run Firework as administrator but DO run PDapp,exe as an administrator, that has worked for some people on Windows, also some people to needed to do a clean install of Fireworks with an offline installer (see the details in an earlier post on this thread). People on Mac Catalina or Big Sur which no longer support 32 appps and can't run Fireworks, have been using a program called Parallels Desktop
You are shouting at the wrong people, this is a user to use forum - Adobe EOL'd Fireworks back in 2013 and will not provide support for it. As a long-time Fireworks user I'm as angry as the next person about that.
If you have a Creative Cloud full subscription you could try Photoshop, although it does have a steeper learning curve and you decent spec computer otherwise it may be slow.
Non Adobe alternatives to Fireworks :
Photopea - a web based app that can open layered Fireworks PNGs and it's very good
Affinity Designer - Available for both Windows & Mac and about the nearest thing to Fireworks. Affiity also have some other programs Publisher and Photo, if you buy all three apps you get the benefit of something called Studio Link that basically combines all three applications into one single one with a huge feature set.
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