Bought two of the add-ons and downloaded them. Also, downloaded the main game. When I try to open the main game zip-file, windows says the file is invalid and it will not open, v. 7.1.4. Please say I do not have to re-download the 2.7 gigs...:( I have a metered connection and it hurts!
Also, do need the v. 7.1.4 download, or, just the v. 8.3.0 ? They are the same size. Both are needed? Or just one?
Depending on which DLC you own, the installation version may not be sufficient. To be sure, install 7.1.4 (OoBWWII-MultiSetupRelease-v7.1.4.exe) and update the game to 8.3.0 (OoBWWII-MultiUpdateComp-v8.3.0.exe). That should encompass all DLC to date.