How to install themes on mi3w (theme not from mi theme market)

[zi wang]

Hey guys, i was trying to install a theme today, specifically the black android theme for miuiv5, so i go to import from sd card in the settings menu of theme app and it gives an error saying i cant install a theme that isnt from the mi theme market. but i see that the black android theme is fully supported miui so how do i install this? thanks in advance!