Problems after updating R

[DavidVJS]

I recently updated my R installation from 3.5.2 to 4.1.1 and am having issues updating Rcall. I set the environment variable as instructed ENV["R_HOME"] = "C:/Program Files/R/R-4.1.1" Pkg.build("RCall") but when I try to use RCall I get an error referring to the previous path InitError: Could not find library C:\Program Files\R\R-3.5.1\bin\x64\R.dll.

Removing RCall using Pkg.rm("RCall") before reinstalling doesn't help. Putting R_HOME in PATH doesn't help. Deleting the pre-compiled RCall files in .julia/compiled/v1.6/RCall doesn't help. This is a standard, single user R installation under windows 10. Deleting the registry entries for the old version of R doesn't help. Clearly RCall is still looking for the old version, but I have no idea where the old reference is coming from.

[terasakisatoshi]

@DavidVJS

Try to modify ENV["R_HOME"]

from

ENV["R_HOME"] = "C:/Program Files/R/R-4.1.1"

to

ENV["R_HOME"] = "C:\\Program Files\\R\\R-4.1.1"