You can only download and purchase extensions on this site or through the Joomla administrator console.
If you downloaded or purchased Simplify Your Web extensions from another site (or received commercial software for free against a subscription), you are subject to malware infection, are not supporting the work of the developers and are not entitled to any assistance.
Don't get scammed into buying a license in exchange for services or goods not offered on this site. You will never receive those goods. Never share your account information.