Thread:Project:Support desk/Content Not Showing In Wiki/reply (13)

Thie Extension:Whos_online should then be uninstalled before you upgrade.

Your situation with the extensions and the default skin makes an upgrade as easy as it could be. Here is more information on how to back up a wiki: Manual:Backing_up_a_wiki.

What do you mean with "permissions and security tweaks"?

It will help to read upgrade while you do it or before you start. I would go for version 1.23.6, which you are offered through Softaculous.