OK do I need to do anything to the forum I've already upgraded to 7.7.3 as a result? Or is it fine as is?
read the changelog.
read the end of the install/alterstyles-XXX.php file.
the changelog tells you about the added css
Is there anything I need to do by hand with MySQL to account for that SQL error in the install? Or is the system fine, and that error didn't matter?
read my reply above your comment. ive quoted it here if you missed it the first time.