How to register and unregister context menu and file association for the archive version of RapidCRC-Unicode?

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I downloaded the archived version of RapidCRC-Unicode (zip file, version 0.3.39.0) tried the command regsvr32.exe rcrcshex64.dll in the command prompt on the RapidCRC's direcrory, the context menu really appears. But when I tried to use the menu, it pops up an error:

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Error Message
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Error opening exe path from registry:

The operation completed successfully.


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OK   
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Also, the registeration cannot add any file associations to the verifacation files ( *.sfv and *.md5 etc).
And I cannot find anyway in the software options for me to register and unregister the context menu and file association. Include the "Menu" option.

Could you please add some options in the software, or add some bat or reg files for us to register and unregister the context menu and file associations, Especially for the archived version. Thank you!

System version is Windows 10 22H2