Help installing Steam

[j2346max]

I want to install steam on my pc and refuses to start. The notification states : Steam cannot run on this version of windows from a path with non-ASCII characters. Please reinstall steam to the default directory or install steam on windows 7 or newer (Please keep in mind that this is a google translation of the original text in german, but i have checked it to the best of my knowledge) I use Windows 11 with a username using an ö i have identified that as a possible problem and changed my microsoft accounts name but it refuses to update on my Pc. I have also tried to create another account on my PC but it continues giving out the same error message.
Anyone got an idea how to fix this ?

[ReBoot]

Let's take that "from" part literally. Save the installer somewhere there absolutely nothing can go wrong, i.e. the root of C:.