When I search for the bitrock_installer.log there are no hits.
The new 1.34 installation seems to work fine. I did not migrate the data, because I need assistance whith this.
This guide explains pretty well the steps you need to perform. If you have the database backup and and files of the old installation
Please note that you don't need to run some commands in the Windows command line. For example, you can manage the services using the manager tool in Windows
Let us know if you have any questions.
I really have no idea where to start...
First: I have an older backup of my database and I copied the complete folder with all MediaWiki. The reason why my backup might eb updated is that I couldn't make a new one because the phpMyAdmin tool did not work due to the error HTTP 500 (i guess)
So, from the guide https://docs.bitnami.com/installer/apps/mediawiki/administration/upgrade/what is applicable to my database: migrate or update?
If the database backup is old, you will need to do both. Migrate the database and app information first and then upgrade it because the version of Mediawiki you have now is probably newer than the version you had when creating the backup