So, I have checked all settings in "tools/database". It all seems fine with the right permissions set.
I did not update to php 7, I kept the 5.6.30. I dont know if I can get my ISP to roll back to an earlier version. My 1.0 version also ran on that php version, so no changes there.
I still get the two error messages when I try to update the forum (v1.2) during step 2, "create new tables":
Creating table forum_thread
Creating table forum_post
Creation of table(s) failed. You can not continue until these are created successfully!
My forum is not that big, and if I DM you are you able to scan for any fix or something I'm doing wrong?
I guess the only thing I still havent tried is to rollback to v1.0 and the old php database. (all new tabels createt in the php from the upgrade to 2.1.15, do I need to delete them or will they be overwritten?) eg, automaticly deleted?)
Hmm, I update this post as I remembered that I did a forum post test before I tried to update the forum to 1.2. When I did this the two posts in the php-database were created (forum_thread and forum_post). Could it be that this halts the creation of those two threads when I try to upgrade?? "Creation of table(s) failed."
If this is true, can I just delete those two posts in the php-database? Worth a try? (I'm not that experienced in php-maintenance so I need to ask first, at least then I know that I might destroy it all...)