Most content packs from the Content Store are supplied as self installing .exe files.
Have you been able to download the content packs locally to your computer (chose Save not Open)?
Once you have two files downloaded you should just need to double click each one and follow the prompts to install. If you are double clicking the .exe files and receiving an error message, please let us know what the error message says.
Thanks.
Peter
Forum Administrator
www.reallusion.com