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Is the file you are trying to upgrade on a networked drive? That has been known to cause this issue. (Or did you put it on a network drive while you were rebuilding the computer?)
Do you have recent backups of the catalog file you can try?
Its sat on my C and always has been on the C drive...... I just copied it away onto a spare drive when I rebuilt the machine and have just put it back on the C drive again.
Found a slightly older backup and that has worked... not ideal, but better than losing everything.
May I jump into this thread please? I am having the same issue; back up is on external drive, trying to load it into classic cc on brand new computer but getting catalog damaged message. any advice? lightroom wont even open now without a working catalog so cannot do export as catalog option. thanks