Latest stable release:
DOWNLOAD CURRENT VERSION
PrimerPrep Installer 3.12 for Windows
EXE | 27.61 MB | 23 Nov 2020
Note: Sometimes the program takes a little while to start up, especially the first time it is opened. This seems to be caused by the graphics engine used. Just be patient. Usually it opens much faster the second time.
PrimerPrep can be run on Linux, but a Linux package has not yet been built, so you must follow the manual instructions at his link: Installing and running PrimerPrep (version 3+) from source code on Linux