I made an experimental 4.19 branch with VXGI, Flow and Blast.
Couple issues left, like Blast Editor isn’t fully working (Opening or creating a Blast mesh with more than 1 depth of destruction crash the editor) and Flow grid Color map are stuck to 64.
VXGI should be working as well as in 4.18.
It can package games, which was the most important part of me hehe.
Will probably share it on my github repo in coming days. Also nvidia Bgaldrikian said on Github that we would most likely get a Blast branch for 4.19 ‘soonish’ 
watch?v=DLS4QUO-C4M