can you sideload an APK into the dlite?

You may be unaware that VPN's are not allowed to be used with IPTV as anyone who uses a VPN may be blocked by the server and banned after the 3rd warning. You can use VPN but not with IPTV servers relating to this forum. As for sideloading the Private Internet Access VPN APK, I really can't answer that as I don't have a T1 Plus. Fact is, you can try and if it loads, it loads, if it doesn't, no harm done because it didn't load.
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The dlite does not support sideloading outside apks, however Captainkangaroo did ask members for recommendations on what VPN(s) to have available on this box.