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See How To Customise Your Game for full details on all of these things!
Yes! Each save on Promotion Wars 1.3 consists of 2 things - a .sav file, and a folder. Both will have the same name as your saved game and will be in the same folder as the exe file you click on to open the game.
Simply put the .sav file into the save folder, then move that save folder into the Saved Games folder of your Promotion Wars 21st Anniversary Edition folder. When you begin Promotion Wars 21st Anniversary Edition, your saved game will be there ready to play.
Yes! Just move the folder containing the scenario from the Scenarios folder of Promotion Wars 1.3 into the Data Packs folder of Promotion Wars 21st Anniversary Edition. When you start a new game, click on Change Data Pack to select your Scenario from the list.
If you notice the game isn't showing any custom logos from your 1.3 save or Scenario, you can easily move them across:
For normal games - look in the Images folder of your Promotion Wars 1.3 folder. Move any image files you want into the Images folder of your Promotion Wars 21st Anniversary Edition folder.
For Scenarios - look in the scenario folder within your Promotion Wars 1.3 'Scenarios' folder, or the 'Images' folder of your Promotion Wars 1.3 folder. Simply move the required image files into the scenario folder contained in the Game Packs folder of Promotion Wars 21st Anniversary Edition.
The game downloads on the Downloads page will always be the latest version, including the latest fix.
If you already have Promotion Wars: 21st Anniversary Edition and want to update it to the latest fix, choose the Basic Download. This will unzip a folder containing the latest version of the game, including all fixes. You can then delete your old game folder, but remember to move across anything you want to keep such as your Saved Games, or any Data Packs or image files you may have added yourself.
I don't rule out any of these. The game is currently for Windows only (as at October 2021). I hope to branch out to the Android app store as my first step away from Windows, so that will be the priority out of the three. That's all I can really say at this point, I see how it goes, monitor the demand and that will decide which directions I take the game in the future.