Download and run Android APK files I want to download BitTorrent Sync to synchronize my Android and PC.

Question #1

What's the difference between download from here or here?

Since I'm not interested in register myself on Google Play, can I download an APK file from any site and run it with some sort of "double click" over the name of the file, in the same way as in Windows? 

Question #2

After download a file where do I save it? In the smartphone RAM? In the SD Card?

Thank you
You can download the APK file with bittorrent to you PC. The other link is not usable if you don't want to register to Google Play. After downloading you transfer it to your phone. Under settings and security you have to enable unknown sources and while tapping on the transferred .APK file, it will be installed.