MSFS relies on a complex "Official" folder structure. Manually injecting a versioned .rar file can break the connection between the Microsoft Store/Steam and your game files, leading to a "Mandatory Update" loop or a complete reinstall.

If you see a link for a .rar file with this specific version name on a forum or file-sharing site, proceed with extreme caution. Here is why:

Microsoft Flight Simulator is designed to update itself automatically. If you are missing updates, follow these steps instead of downloading external archives:

Enhancements to the glass cockpit systems used in many GA aircraft.

Better frame rates for both PC and Xbox users.

The introduction of the highly detailed IniBuilds A320neo for all users. The Risks of Downloading .rar Files from Third Parties

rar files from unofficial sources, and the best way to keep your flight experience up to date. What is Version 1.37.19.0?

Version was a significant update in the Microsoft Flight Simulator (MSFS) lifecycle, specifically linked to Sim Update 15 (SU15) . Released in early 2024, this update focused heavily on: