NI LabVIEW Run-Time Engine 8.5.1 is a legacy software component originally released in 2008. While "2021" likely refers to the year you are searching or a modern version of LabVIEW, version 8.5.1 remains a distinct, older requirement for specific legacy applications. Download Options for LabVIEW Runtime 8.5.1 Official NI Archives : You can find this version on the official NI Product Downloads
To understand the demand for version 8.5.1, one must first understand the function of the Run-Time Engine. labview runtime engine 85 1 download 2021
As of 2021 and beyond, National Instruments (NI) has moved much of its software management to the NI Package Manager, but legacy versions like 8.5.1 are primarily found through specific archive pages or direct FTP links. NI LabVIEW Run-Time Engine 8
NI Package Manager: If you have the NI Package Manager installed, search for "LabVIEW Runtime" and select version 8.5.1 to install it directly. To understand the demand for version 8