Just to be ure, I deleted the latest installation (again) and upgraded to bitnami-mediawiki-1.34.0-2-windows-x64.
Unfortunately, your instructions do not help me, because the old installation of mediaWiki was corrupted and did nog function anymore. re-installation of this old version gives some error messages, as I stated in my opst of february 12th:
""Problem running post-install step. Installation may not complete correctly. Error running...Warning: Require_once .. failed to open stream: No such file or directory in ...on line 24
PHP fatal error: require_one(): failed opening required, etc, etc" (The … refer to the location of my wiki)
The I got the 404 error while trying to open the wiki."
So I cannot make a backup of my old wiki, I suppose…?