Tried mutiple times through devtools to tinstall by the command line
devtools::install_github("roche/rtables")
devtools::install_github("roche/rtables", ref="v4.0.2")
It seems the previous installation of rlang can't be removed probably because you have it loaded. Restart RStudio and try to install again before loading anything, if this doesn't help, manually delete the rlang package before installing the new version.
Note: Please do not post screenshots here (it is considered bad practice), post formatted code instead, here is how to do it: