If you are running the repack, you should notice three distinct stability improvements over older builds (e.g., 1.460.860.0):

The update corresponding to versions primarily focuses on stability, accessibility, and service maintenance for Forza Horizon 4 Update Details Version 1.465.282.0 : This build was released in March 2021

The primary objective of updates 1465282 and 1478564 was stability. Prior to these patches, the PC version, in particular, suffered from sporadic crashing, often related to memory leaks and shader caching issues on certain GPU architectures.

If you have a repack sitting at and want to reach 1478564 :

: Minor back-end fixes to ensure continued online functionality. Key Version Information