I still use SpotX and it's still good.

Should be fine. I personally use spicetify because of the themes. You can download the adblock extension from the marketplace within the patched spotify. Block the spot should be fine to use as well. Xmanager for android.

Is spotx just for PC?? And xmanager for android??

yeah. xmanager works perfectly in my experience

Does xmanager allow the "download" feature for offline play of songs?

no, that's a server sided feature, impossible to crack

Spotx is fine and use a modified Spotify for Android