Substratum theme engine

[neilhicks18191]

Why won't it work on Moto E-4 it's says you can't use it at this time

 

[Hadron]

On older android versions you need root. On more recent ones you can use an app called Andromeda (paid) to enable it without root - requires a computer and has to be re-enabled after a reboot (applied themes remain, but you can't use Substratum to change anything without re-enabling).

Since I don't know what android version you are running or whether you are rooted I can't say whether that is the answer, but that's the most obvious reason for it not working.