Path of upgrading from owncloud 8.1.5 to newest 9.x Version

[mart314]

You might be interested in reading my experience at

Hosted upgrade from 8.2.10 -> 9.0.8 failed - what to do?

Unfortunately not. I am using a webhoster that gives me access to the PHP error logs (which show no error) but not the web server logs... The upgrade seems to run pretty fast on re-running it, only the integrity check runs for maybe a minute before that generic error message appears. Happy to hack something, since this is all just to get upgraded to the very latest version (provided I don't have to hack all the way?)

which took me from 8.2.0 to 8.2.10 to 9.0.8 to 9.1.4