The mods internal name, folder path and Lua paths are inconsistent which causes crash at startup.
The json names the mod "infinite-quality-tiers-plus" but the folder name is "infinite-quality-tiers+" while the Lua paths are still original with "infinite-quality-tiers".

Temporary fix was to unzip, change the info.json internal name back to "infinite-quality-tiers", remove the "+" from the folder name, re-zip it as "infinite-quality-tiers_1.0.6.zip" for it to launch.

Sorry about that.
The problem has been fixed.

The Lua paths for each icon and tech in data.lua are still unchanged from original mod and still causes crash.
From data.lua:
icon = "infinite-quality-tiers/graphics/icons/quality-pips-background.png",
Should be:
icon = "infinite-quality-tiers-plus/graphics/icons/quality-pips-background.png",
There are 6 instances of icon and 6 of tech that needs to be changed.

fixed in the latest version.