2020 ue 4.21 beta not working

Hello, I am a player who plays automation regularly. yesterday, I downloaded tried to open that 2020 beta
on steam to get some old good memories of what I have done. however, it does not open, with a message that says “some files are missing” and it seems some of these files are corrupted. is there someone that can help with this error? thanks for every kind of helps.

Did you, ugh, read the post?

@ricecakeman Basic question - did you verify the files?

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