The Installer for the latest official release may be found at this link

Download both the OpenDSS Installer file and any other files of interest on the download page.

Release version installers are posted at irregular intervals. If you have a Delphi compiler, up-to-date versions may be built from the source code, which contains the latest changes. If you don't have a compiler that can build the program, the latest beta builds are posted at these locations: (32-bit version) (64-bit version)

The latest build is generally just fine and you may need it to access the latest features reported in the Wiki. However, there is a small risk some bug has crept into the code as changes were made. Report any problems as soon as possible.