I notice you’re asking about — but there is no official version “1251” of Vectorworks. The most likely scenario is a typo , and you probably mean:

: If you are a student or educator, you can request a free educational license for the 2021 version (or the latest) via the Vectorworks Education Page Windows System Requirements for Vectorworks 2021

Before installing, ensure your PC meets these specifications for the 2021 version: