Past releases are in the PGI release archive. Multiple releases can be installed on the same system. Current PGI license keys work with all older releases.
While you are free to download any of these files, you will only be able to use the components for which valid license keys are installed.
PGI Accelerator compilers (including CUDA Fortran) are contained in all PGI 2010 or later download packages.
All PGI 64-bit product software includes 32-bit compilers.