Blender: Over 3 weight links, Source does not support this!

(I have made a post like this before, but I think this one will get my point across better)
I am trying to export a XNALara model to SFM, but when I try to export it, this message pops up:

The export still happens, but (obviously) the model doesn’t compile to Source when running studiomdl.bat. What I want to know is, how can I fix this and import the model to Source properly?
The models I’m trying to import are:
http://xnalara-customized.deviantart.com/art/Injustice-Gods-Among-Us-Superman-new-52-375331014 and http://xnalara-customized.deviantart.com/art/Injustice-Gods-Among-Us-Superman-new-52-375331014.

Go to weight paint mode, limit total, decrease number to 3, make sure it’s applied to all vertex groups. Do this on all DMX files. Boom, done. You could also use SMD instead of DMX.

Thanks, it appears to be working now!