I get a security warning about some of your downloads.
Are your downloads safe?
Yes, of course. It can be that you computer doesn't like the .package files and thinks they might be malware, but I guarantee you a 100% they're fine. This site exists for over three years and not once has anyone reported any problems caused by my downloads.
Are the downloads on this site free?
Yes.
How to unpack the zip-files
Download Winzip (simply google it), it is a free software and lets you unpack the package-files. This is the first step you need to take in order to access the package-files.
How to install content from this site
I find this question a lot in the comments, so I will link you to the appropriate sites and tutorials:
Mod The Sims: Installing Sims 3 Package Files/Setup and Files
Mod The Sims: Installing Sims 3 Package Files/Setup and Files