You need administrative rights for this installation. If you don't have administrative rights or if you want to download one of the old versions then click here.
You can take also the Source Code of the compiler.
If you want the Professional or the Middle Edition then click here.
Middle Edition (no new version)
Professional Edition (no new version)
If you do not want to install the compiler then you can download only the Help file or to read online the Strawberry Prolog Help.