Strawberry Prolog version 5.1 from March 25, 2020. Light Edition (it is free)

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.
 

If you want the Professional or the Middle Edition or the Source Code then click here.
Middle Edition
Professional Edition
Source Code of the compiler

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.