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How many times on that landing page do they mention "Windows PC"? Eleven times! We got the message!

It looks like they're trying to resist "Great software, but can you release a Mac version"?

That was a landing page for Windows version, what do you expect?. Here is home page: https://clipchamp.com/

The OP link should be this. But I found that even on MacOS Chrome I got the 'browser unsupported' message

Works for me (M1 Pro MBP, updated Chrome)