Hello,
Sorry to hear you are having trouble.
For most apps that have downloadable content, items are stored here:
C:\Users\Public\Documents\Stardock
For the actual installers for the apps, you can get them from your account page:
https://store.stardock.com/myaccount/products
or the retrieval page:
http://www.stardock.com/support/productkeyretrieval
Sean Drohan
Stardock Support Manager