My game installed and the configuration launcher would open but the game would not launch because the Physx package was not installed into the Proton prefix. This can be remedied with Protontricks, which can be installed as a flatpak.

• Open Protontricks and select the default wineprefix for Dragon Age Origins

• Select “Install a Windows DLL or component”

• Select physx, click OK and follow the prompts for the install wizard

• When finished, cancel/close out of Protontricks

If the game is missing the DLC content from the Ultimate Edition:

• Open Protontricks and select Dragon Age's default wineprefex

• Select Run Explorer

• You will need to enter the following into the address bar manually to reach the hidden .steam folder: Z:\home\[Your User Name]\.steam 

• Browse further into \steam\steamapps\common\Dragon Age Ultimate Edition\redist

• Run these two executables in order: DAUServiceSetup_Steam.exe, DAOU_UpdateAddinsXML_Steam.exe

• Close out of Explorer and close/cancel out of Protontricks

    

If your DLC still does not appear, it may be possible to download the individual DLC packages from https://help.ea.com/en/help/faq/dlc-for-classic-games/#dragonage and install them manually using wine or protontricks, though doing so may be meticulous and time consuming.

Some guides advise adding the following command launch options to the game. This should not be necessary to launch and run the game, but may improve performance: PROTON_FORCE_LARGE_ADDRESS_AWARE=1 PROTON_USE_D9VK=1