Tested it this morning with my second forum like this../nodebb upgrade
Aborted with error. node_modules/ saved elsewhere. Then anpm install
Then checked the versionnpm list sharp
Was the right version.
After that./nodebb upgrade
Ran through flawlessly. Then rebuild & restart.
Oddly enough, I always have to run ./nodebb upgrade twice with this version until the forum works properly. But this should not be the problem here.
Now I'm on version 1.18.5 - a stony way.
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@pitaj Thank you!