Yo. I’m not the dev, but I just spent some time making some updates to the v0.6 fork of this add-on to make it compatible with Blender 2.8. Seems to work fine now. This is meant as a temporary solution until the real devs update the code themselves and add new features, etc. Hope you guys don’t mind. 
This is a single py file. After you install it, it appends itself to mesh edit mode RMB-click context menu as “Easy Lattice,” and also to the object mode RMB context menu.
UPDATE #4, 5/31:
- fixed (my) bad bug where a specific sub-object selection would be replaced by a whole-mesh selection, oops
- (still has old bug / limitation that makes is so you can’t work w/ more than one object + lattice at a time)
- Xray mode now auto-enabled when adding lattice
- allows you to add lattice in object mode, w/ no sub-obj selection