So, currently, those who have the Armeida Tactics DLC installed are unable to launch anything besides Armeida Tactics. Unfortunately the DLC overwrites the main game's files instead of adding a separate folder inside of them. When you turn off the DLC everything works as intended.
So, with trying to make it work as intended, nothing remotely worked as it was supposed to.
I found a solution that did work however.
I added Armeida Tactics within the game's folder as a seperate folder and the launcher options now work as intended, provided you do not have the DLC installed. The DLC will no longer automatically install for new players. Those who have the DLC installed, should promptly uninstall it for everything to function properly. Again, with the DLC unchecked, you will still be able to play both Solenars Edge II and Armeida Tactics.
Lastly, Armeida Tactics will be removed as DLC and will not be ownable/downloadable in the future.
It will instead be installed within it's own folder within the main game's folder.
When current/new players of Solenars Edge II: Aurora of The Seventh Dawn, buy/start the game. The game's folder will contain both SEII and Armeida Tactics and will both be launch-able as separate games.
I apologize for this inconvenience and all should work as intended as long as those who own the DLC do NOT enable it.