There were a lot of unexpected bugs in this game.
To eliminate the possibility that the additional helicopter version will adversely affect the full version, we will move the additional helicopter version to version 2.00.
Keep the full version and update to version 2.00 if we want to update.
To access version 2.00
Right click on the game name in the STEAM app.
Properties, Beta tab.
Select from the drop-down list.