Problems getting Stan to run after upgrading to R 4.0.2

Interfaces RStan
4

Thanks very much for your reply.
The error message I got now is

Error in compileCode(f, code, language = language, verbose = verbose) : 
  sh: C:/Rtools/mingw_64/bin/g++: No such file or directorymake: *** [C:/PROGRA~1/R/R-40~1.2/etc/x64/Makeconf:229: file1fc42e38522.o] Error 127
In addition: Warning messages:
1: In find.package(package, lib.loc, verbose = verbose) :
  package ‘base’ found more than once, using the first from
  “C:/PROGRA~1/R/R-40~1.2/library/base”,
  “C:/Program Files/R/R-4.0.2/library/base”
2: In system(paste(CXX, ARGS), ignore.stdout = TRUE, ignore.stderr = TRUE) :
  'C:/RBUILD~1/4.0/usr/mingw_/bin/g++' not found

I finished the MBiostats last semester at Sydney Uni.
Are you Sydney based (if it’s not an inappropriate question on a public forum)?
Regards
Chris