THX Spatial audio app not installing

Hi, i have a few problems with the thx app. I downloaded both the 7.1 surround sound and the thx spatial audio app installers. But the downloads of both apps all get stuck at 98%, i tried multiple times but they always get stuck. I can still open the window to insert the activation code they sent me, but it says it's invalid. I payed for the THX spatial audio app, but i can only insert the code for the 7.1 surround sound app, so maybe this is causing the problem? However the most important problem rn are the apps not installing.