Thanks for your (always!) fast assistance, Caty. I verified the hash checksum of the three downloaded parts with the ones you provided in post #65. Although JDownloader auto-unzip had a problem with part #3, it appears to be part #2 whose checksum does not match (see screenshot below). The checksum of part #1 and #3 are correct.

part2nomatch

So instead of reuploading part #3, please re-upload part #2 first. Thanks again for your help!