I had the same problem when i upgraded from 2.0.8 to 2.1.
I tried upgrading with nxdbmgr and trace parameter (-t) to see more details on which table it has problem with then i restored db from backup, deleted the tdata table it had problem with then upgraded manually.
I also tried ignoring errors (-X) and it worked but i did not trust that but it is something you can try just backup db before.
the db version 410 is because the installer upgrades the DB and fails halfway so thats why you can't use it with 2.0.8.
