How do I turn off the damn shop ads ?

Install the tiktok pro app ( its entirely free and official )

https://play.google.com/store/apps/details?id=com.ss.android.ugc.tiktok.pro&hl=de&pli=1

if its not availaible in your country download it off a mirror.

Same account and everything.

Tiktok Lite is built for slower devices to not have Tiktok Shop, live streams, etc that can be difficult for slower devices to load.

Only use official Tiktok apps. It can be a security risk to use 3rd party apps.