Move to new PC and corrupted Catalog

https://forums.adobe.com/people/Hemel+Brian  wrote I have at the moment PSE10 and 22,000 pics in one Catalog.  My OS is Windows 10. I have two related questions.  I moved from an older PC to a new one.  I have a Catalog on an external drive which I used to restore on the new PC.  I have just found out that many of pic files are now corrupted with the wrong keywords tags, additional copies (always four in total) being added, and some pics apparently missing.  I have compared the two PCs and concluded that the Catalog on the old PC is still correct.  So I did some research and troubleshooting.  I am happy to do a new Catalog if required and then try to restore it on the new PC.

Can you confirm that you did use the backup and restore process to create a backup folder on an external drive, then you used PSE10 on the second computer to do a restore from the backup folder on the external drive?

Move Elements Organizer catalog

I have no idea why you got a corrupt 'catalog' and multiple duplicates with that process.

But here is the first question.  The info from the Adobe website states I should use the SAME user name on both PCs but in my case, they are different.  Hence is this essential or will the restore still work?  Hence is this essential or will the restore still work?  Or is this the reason of the corrupted files?

Where did you find that? The license is granted for a single user, for allowed use on two computers. That has nothing to do with your problem. If the second computer is correctly licensed, even to another user, the restore will work.

Second question.  I intended to upgrade to the latest PSE which I assume is PSE18.  Whether I upgrade or not, should I delete the PSE10 that is on the new PC and then re-install before I attempt a re-install?

No. Your choice is either to restore from the PSE10 version on the second PC, then to install PSE 2018 and simply 'convert' the PSE10 catalog to the new format. No change will happen to your photo files; a new catalog will be created for PSE2018 and the PSE10 catalog will still be valid with PSE10. You can keep both versions on the new computer.

Or you install PSE 2018 on the second computer together with PSE10 (no need to uninstall it, they can be kept together).

From PSE 2018 you do a Restore from the backup catalog on the external drive. The restore process will restore your media files and the PSE10 catalog folder; at the end of the process, it will convert the catalog to the 2018 version.

And I assume the restore will overwrite the pic files anyway.  I will give the Catalog a new name as well so that it is different to that in use today on both PCs.

The media files on your new computer are most probably not trustworthy, since you have got multiple duplicates.

It would be advisable either to delete them before the restore, or (better if you have enough space) to specify a new master folder in your second drive. If the new restore is successful, you'll be able to delete the bad previous ones. Of course, specify a new name for the second restore.