Version 8.5.1 is very old (released ~2008). It is not compatible with modern Windows (10/11) or modern LabVIEW versions. Use it only for legacy hardware/software.
However, NI does maintain the files. They are just hidden behind login walls and outdated support portals. labview runtime engine 85 1 download hot
: The primary source is the NI LabVIEW Runtime Download page . Note that downloading older versions typically requires an active NI service agreement or subscription. Version 8
LabVIEW Run-Time Engine 8.5.1 is a critical software component required to run executables or shared libraries built with LabVIEW 8.5.1 on systems that do not have the full development environment installed. While it is a legacy version, it remains essential for maintaining older automated test and measurement systems. National Instruments Core Functionality Application Execution However, NI does maintain the files
Note : Accessing older software often requires a valid NI account and sometimes an active service agreement.
Performance & reliability