Are you planning to use that require this legacy version, or
: It was the final major stable build released in December 2020 before significant overhauls were introduced. Project Wingman Free Download v1.0.4d
: A full single-player experience set in an alternate-history Earth (the "Aftermath"), featuring over 20 missions ranging from anti-shipping strikes to high-altitude intercept missions. Are you planning to use that require this
: Press Win + R and enter steam://open/console . Project Wingman Free Download v1.0.4d
: Replace the files in your Project Wingman Steam folder with the downloaded depot files and disable automatic updates to lock the version.
For owners of the game on Steam, you can officially "downgrade" to this version using the Steam Console to ensure a clean, legacy installation.