Where i can find the "Summer Link WiFi" app?

There is no Summer link app for a Mac or PC, it is internet based.

The Summer Link WiFi System is completely web and APP-based. There is no software to download to your PC or MAC. You can set up your Summer Link WiFi system by downloading the free APP on your Android or iPhone smartphone or tablet.

http://www.summerinfant.com/consumer-care/faqs

There is an iOS app for set up;

https://itunes.apple.com/us/app/summer-link/id732316361?mt=8

Hi i dont Live in usa, i Need this App for my baby system. Its very important for me have this.

So how i can have this, i Live in Colombia.

Thanks for your support

If the developer doesn't choose to make their app available in your country, there is nothing that can be done about it.