I am working only with Fortran 32 .
Trying to upgrade to PS 18-4 or PS 19 you can only install Fortran 32 together with Fortran 64. Trying to install only Fortran 32 it grays the item and says dependency not satisfied.
The 2017 and more recent versions of Parallel Studio no longer support installation on 32-bit development hosts. The compiler itself is now only provided in 64-bit EXE form. You can use a 64-bit host to develop 32-bit applications which you can move to a 32-bit target PC and run, but development is possible only on a 64-bit PC.