Its safe install new beta 15 and then return to previous version?

[SmotheryVase665]

Reverting back to the live version can be done. See the instructions here.

Snippet for STEAM:

@Jummivana

If you would like to exit the pre-release test before it ends and revert back to the live build, follow these instructions:

1. Open your Steam Library
2. Right-click Microsoft Flight Simulator
3. Click “Properties”
4. Click “Betas”
5. Select “None”