There are no more 32-bit versions it seems. I hope someday the ARM64 build And a Mac version for WinRAR (tentatively named MacRAR)
Does WinRAR have a context menu for checking the hash on files? I didn't notice one on the latest WinRAR about a week ago, but 7-Zip has context menus for hash checking.
Not the full story. CRC32 is used in ZIP and 7z and possibly all other "foreign" archive types. For RAR 5.0 archives, you can activate the usage of BLAKE2 (BLAKE2sp, to be exact) checksums.