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First things first - did you do a "noconfig" backup of your 10.4 server? I don't think that's the issue, but it could be.
The error message makes me think it's a licensing issue, though.
You should apply your licence key(s) to the new server - you should be OK. Tableau did not appear to enforce the license key count very strictly on the older license formats (pre-2018). They DO enforce them on the new format, though.
I didn't do the "noconfig" on the backup, i am kind of new to tableau server. Where should i put the noconfig, i tried "tabadmin backup --no-config bak.tsbak" and it didn't work, it says that --no-config ia a unkown command.
I will try now to activate and restore.
Tried the other way too, still Unknown Command.
You should activate server license keys first.
Please show us the full backup script and the full restore script.
i am using to backup :
tabadmin backup bak.tsbak
and to restore:
tsm maintenance restore -f bak.tsbak
I will try to activate my server license on wednesday and post the results here
I solved the problem, it was just a directory issue.
i followed these steps:
1. Installed the same version (10.1) on a new computer
2. Restaured from my production environment
3. Upgraded version by version (10.2 -> 10.3 -> 10.4 -> 10.5 -> 2018.1)
4. Then did a new backup of my 2018.1 tableau server ("tabadmin backup bak.tsbak")
5. Uninstalled the 2018.1 version
6. Installed the 2018.2 version
7. Activated the key and TSM
8. Stopped TSM
9. And then used "tsm maintenance restore -f bak.tsbak"C:\ProgramData\Tableau\Tableau Server\data\tabsvc\files\backups\bak.tsbak
At this point, the same error appears, asset_keys.yml not found. But this time i noticed the directory where de bak.tsbak was being searched.
When you uninstall, probably he will create a standard backup on this directory, but on my case he wasn't doing it, so i copied my manual backup to the directory above and it worked.