how to install multiple R versions on MacOS Catalina (version 10.15.2)

Before upgrading my MacBook Pro (early 2015) to macOS catalina 10.15.2, I can install multiple versions of R by first running some commands like this:

sudo pkgutil --forget org.r-project.R.mavericks.fw.pkg

sudo pkgutil --forget org.r-project.R.mavericks.GUI.pkg


sudo pkgutil --forget org.r-project.R.mavericks.GUI64.pkg

But under Catalina 10.15.2, the above commands didn't work any more. The following error was shown:

"No receipt for 'org.r-project.R.mavericks.fw.pkg' found at '/'."

I would greatly appreciate any help.

Best,

Jeff