Can't open in-game store since patch 2.0

[HMAS-Nameless]

As the title says since downloading and installing patch 2.0 I havent been able to open the in-game store at all. I click on the button saying new dlcs for download etc. and it lights up as if I have clicked it yet nothing happens? I have gone as far as entirely reinstalling the game and deleting all dlcs and this still occurs. Is this a known issue or something I have done wrong? Any tips?
Thanks

EDIT: I have the correct Checksum

 

[Aardvark Bellay]

Have you got Steam running ? If so, quit it for the time playing the GG variant. There's a conflict.

 

[Aardvark Bellay]

Update:
Delete the steam_appid.txt file in the GG install.
It got int the patch by accident. Probably the reason.

Though i'm abit confused by your post. Did you actually try to open the "ingame-store" tab in the main menu or did you click on this ad-picture ?
And you know you need to log in with GG inside the ingame store ?