Update 4.1.5.2 to 4.1.8 stuck at Cleaning up tags

[Steffen Loos]

We recently did a test migration from vBulletin 4.2.2 to IP 4.1.5.2, which we were able to complete successfully as far as we can tell. We are now trying to update to the latest version 4.1.8. However, when running the upgrade, it will stop at "Cleaning up tags (Converted so far: 0 out of 0)" and no further progress is made. This was tested on different computers and browsers. We also tried to start the upgrade from the beginning but still face the same behavior. Help regarding this matter is much appreciated.

[KasperVld]

I'm running into the same issue upgrading from 4.1.5.2 to 4.1.8.1