MultiPacker now its free, allowing everyone enjoy and use it; if you want to support MultiPacker you can do it in Patreon. https://www.patreon.com/EstudioCheke
MutiPacker will grow with your support.
If you want to download MultiPacker Precompiled to Unreal Engine, almost the three last versions are supported on Unreal Engine Marketplace. https://www.unrealengine.com/marketplace/multipacker-texture-and-material-packer?sessionInvalidated=true
This project is developed under the Unreal Engine 4.16 version and verified by builds on every version at almost the last one at this moment 4.23. The code uses some tricks via defines allowed by unreal engine to have the same functionality on all the version by equal.
If you want to compile the code to another version different to 4.16 you need to change on MultiPacker.uplugin the line "EngineVersion": "4.16.0", and change "4.16.0" to the number of version you use. Example: "EngineVersion": "4.18.0" ,
https://www.youtube.com/user/turbocheke/videos
https://github.com/cheke/MultiPackerProject
https://cheke.github.io/MultiPacker/ I try to continually update the documentation