I suspect R is having issues with non-ASCII characters in your Windows user name (this is a known issue) but I can't be sure since you are not posting the complete output message.
In case I'm right, you can fix this issue by changing your user folders name or installing into the system level package library instead.
You can change the default library folder by setting your R_LIBS_SITE environmental variable on a .Reviron or .Rprofile file
# In a .Renviron file you can set it by adding this line
R_LIBS_SITE="C:\\Program Files\\R\\R-4.0.3\\library"
For a more detailed explanation, you can read this blog post