I'm the author of RCU. Some details are missing that would help with troubleshooting your problem. Would you post a video showing you extracting the package, then right-clicking on RCU.app > Open > Open, and of the error message thereafter?
Do you have an active support period for the program? (Wondering why you didn't email me directly, which could result with more-helpful information. I just happen to watch RSS feeds for this subreddit.)
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