Worked very well with Tlauncher right until the 47.0.45 update some days ago. As of right now the default Steve skin is glitching (shows transparent spaces) and can't change to skin.
Help needed, please do, your mod is way too good not to be used.

Attached the glitch.

I fixed it, i'm sorry. There's a check in Tlaunchers account settings, you need to disable Tlauncher skins, and therefore it can work. Deeply sorry.