I tried to reinstall them when they stopped working. Now I cant even install them. Is there another way I can download the models I purchased on the marketplace? I even tried using the older version links to install them manually and those crash.. i dont understand why i cant just download the files and put them in the correct folder myself

Hi,

Did you try this?
If still not work, you may submit a support ticket, we will need to collect some information from you. 

And if you are hurry to use the content, suggest you remove Smart Galley and try the old way to download your content: 
https://www.reallusion.com/downloader/

Hope the above information helps 

Edward