My question is related to this topic:
I have the same issue and it seems to be unsolved.
My last version of Rstudio was 2022.02.3. Today I wanted to update to 2023.06.0. I downloaded and extracted the file: RStudio-2023.06.0-421.zip. When I now start rstudio.exe I get the error messegage "Rstudio is not working anymore". In the previous version I had to point to the folder, wehre R is installed. Now Rstudio crashes with no possibility to choose for R-version. I gues it is related to the last post in the above mentioned topic:
Followup: Portable RStudio does not work on computers that don't have R installed. When portable RStudio starts, it pops up a message that R is not installed with no option to point to portable R.