Official support for version 1.15 has largely transitioned to newer platforms. You can find the software through the following types of sources:
Most SET series total stations originally shipped with a Prolink CD. If you have the physical disc, it remains the most secure source. sokkia prolink 115 software free download install
: Check the SOKKIA Positioning Support site. While they promote newer versions, legacy utility software is sometimes listed under the "Utility Software" or "Archive" sections. Official support for version 1