This new version adds a basic upscale/downscale option. For the time being it roughly works on most blocks/items/entities/CTM but not modded stuff. The main issue is that entities with atlases (armor stand, boats, …) won’t keep their original ratio and thus will result in a much lower-res version than intended after up/downscaling. I might look into improving that someday.
In the meantime, enjoy this new option !
As always, tutorial available here.