MSI to EXE package format
Starting with the Illumio Core 21.2.1 release, the Windows VEN installer switched from the MSI to the EXE package format. Customers upgrading their VENs by using the PCE-based VEN deployment (the VEN Library) must take an extra step for the transition.
Illumio Core customers running older MSI-based Windows VENs must upgrade to 19.3.6+H1-VEN or 21.2.0+H2-VEN before upgrading their VENs to 21.2.1 or a later version. The 21.2.0+H2-VEN release contains the necessary VEN changes to handle the transition in the VEN packaging from MSI to EXE format.