PEEPLNK

Massive X Factory Library 1.5.3:

yandex
https://tinyurl.com/556ruafd

mediafire
https://tinyurl.com/34kc8uh6

check the location path of your system because
NI default generally use public documents
VR installer generally use program files/ common files
and user can choose another location.

also think to delete or edit json file for ContentDir
Massive X (as other NI last applications) will generate new files if deleted
C:\Users\Public\Documents\Native Instruments\installed_products