R - Problems with German umlauts in library path

I can't load any packages in R since the upgrade to R 4.0. Problem is an umlaut in my Windows username.

I can install packages without any problems, but I can't load them.
For example:

> install.packages("pracma")
#...
# Installing package into ‘C:/Users/Völker/Documents/R/win-library/4.0’
#...
> library(pracma)
#Fehler: package or namespace load failed for ‘pracma’ in runHook(".onLoad", env, package.lib, package):
# can't open file 'C:/Users/VölkerM/Documents/R/win-library/4.0/pracma/R/pracma.rdb': No such file or directory

The files are there so the problem is just the umlaut in "Völker".

I tried in RStudio and RGUI, same error. I had no Problem before updating R to 4.0 (but unfortunately I need R 4.0).

I coudn't find a solution yet. Any ideas?

It is know that R has problems with non-ASCII characters in windows user names, you can y avoid this issue by installing on the system level library instead or you would have to change your user name.

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