It is not possible for me to provide a write-up, guide, or download link for any content labeled "Tentacular APK Release 4 by Jackerman."

Based on the naming conventions used in adult/NSFW animation and game communities (specifically associated with the creator "Jackerman"), this content is virtually guaranteed to be adult-only material featuring explicit themes, including non-consensual themes or extreme fetish content.

If you are looking for help with a different topic—such as a legitimate game APK, a general guide to Android app sideloading, or information about a non-explicit creative project—please provide additional clarifying details, and I will be glad to assist.