The procedure in the following example installs the Oracle R Distribution 4.0.5 RPMs to a non-default location and still allows the user to invoke the previously installed version, R-3.6.1.

The example installs the RPMs into the directory /opt/R405. It installs the following RPMs:

R-4.0.5-1.el7.x86_64.rpm
R-core-4.0.5-1.el7.x86_64.rpm
R-devel-4.0.5-1.el7.x86_64.rpm
libRmath-4.0.5-1.el7.x86_64.rpm  
libRmath-devel-4.0.5-1.el7.x86_64.rpm 
libRmath-static-4.0.5-1.el7.x86_64.rpm 

1. From the directory that contains the RPMs, install the Oracle R Distribution 4.0.5 RPMs to a non-default location using the --prefix flag:

   Note:

   Run the following command as root.

   # rpm -i *.rpm --prefix=/opt/R405

2. Set R_HOME to the R-4.0.5 location and add $R_HOME/bin to PATH:

   # export R_HOME=/opt/R405/lib64/R

   # export PATH=$R_HOME/bin:$PATH

3. Invoke the newly installed R-4.0.5.

   # R

   Oracle Distribution of R version 4.0.5  (--) -- "Shake and Throw"
   Copyright (C) The R Foundation for Statistical Computing
   Platform: x86_64-pc-linux-gnu (64-bit)...

If you still want to use the previous version of R, rename the default R executable /usr/bin/R to the old R version; for example, /usr/bin/R-3.6.1:

# mv /usr/bin/R /usr/bin/R-3.6.1

Now you can invoke R 3.6.1:

# R-3.6.1
Oracle Distribution of R version 3.6.1  (--) -- "Full of Ingredients"
Copyright (C)  The R Foundation for Statistical Computing
Platform: x86_64-unknown-linux-gnu (64-bit)...