[R-SIG-Mac] Testing R4.0.5

[brodie gaslam]

I was looking to test the R4.0.5 binaries from mac.r-project.org,
but it seems that the R-4.0-branch items are actually 4.1 r-devel,
currently.  I am not super familiar with these as I only recently
started using them, but IIRC at least when I was testing 4.0.4
I seem to recall being able to just untar the tar.gz as per
instructions and have it available via e.g. Rswitch.  Inspecting
the tar.gz I see a mostly empty folder under:

Library/Frameworks/R.frameworks/Versions/4.0

But a complete one under:

Library/Frameworks/R.frameworks/Versions/4.1

Of the same tar.gz.

Again, I'm not super familiar with this set-up, but in previous
versions this "just worked", so it feels like maybe something
isn't right here.

The tar.gz in question is labeled: "Mar 25 20:43".

Best,

B.