Thank you for all the efforts to enable it for some of us. However, for those lucky GS5 owners, I am not sure if we are aware of one of the criteria for Download Booster to work beyond the 30MB download file size...
Originally Posted by AnandTech
There are other limitations as well. File downloads smaller than 30MB won't trigger download booster. Similarly, if one of the interfaces is substantially faster than the other download booster won't activate either. My home internet connection can regularly pull files down at 50 - 60Mbps, compared to < 10Mbps for T-Mobile LTE. When I was getting ~7Mbps over LTE and 50Mbps over WiFi, download booster automatically turned itself off. If I throttled my home network to 22Mbps however, download booster did its thing and gave me a healthy combined download speed of 30Mbps.