Hi Jonas Rembratt,
The best option is to try to use the Windows 10 ISO to try to upgrade your system to the latest version.
With these major upgrades, the most successful method is to upgrade from the Windows 10 ISO - you download the ISO and then perform an Offline Upgrade
Please follow the steps, this is then just an update and your files and applications will remain untouched.
Click this link:
https://www.microsoft.com/en-us/software-downlo...
to download the Media Creation Tool (Click on Download Tool Now), with that you can download the latest Windows 10 ISO (Select Create Installation Media for Another PC), then choose ISO, not USB
When the ISO file completes downloading
Disconnect from the Internet
Disconnect all external devices with the exception of a mouse or keyboard.
Temporarily disable any 3rd party Anti-virus you may have installed
Then, in Windows File Explorer, double click the ISO and then run Setup.exe and select the upgrade option.