If you are trying to install 1.2.xxxx RStudio then the answer is no, it doesn't support 32-bit R - Unable to select 32-bit R version in RStudio v1.2.1047-1 Preview
If you are trying to install 1.2.xxxx RStudio then the answer is no, it doesn't support 32-bit R - Unable to select 32-bit R version in RStudio v1.2.1047-1 Preview