1) If you're on Windows 10, make sure you have the latest Windows updates
2) Try removing Fireworks and the licence id from your current machine with the Adobe Creative Cloud Cleaner Tool and then reinstalling 3) After clean up try installing with a Fireworks offline installer from here, read the instructions, you'll need to visit this page first to set an Adobe cookie before trying to download (these are official Adobe installers).
Alternatives to Fireworks are Photopea, a web based sort of Photoshop clone that can open layered Fireworks PNG files, if you have a full Adobe subscription, then Illustrator and Photoshop are options, albeit they have a much steeper learning curve. Affinity Designer is probably the nearest thing around to Fireworks IMO, it has a lot of similarities.
If you manage to get Fireworks working again, you can use these Fireworks commands to bulk convert your layered Fireworks PNGs top other formats, like PSD for example.
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