Seriously guys, if you read the description and know anything about GMod you can clearly see he did not make these himself. He simply ripped the CW Flash model from Injustice, and made a few minor edits to them to create the Reverse Flash and Zoom! Stop begging for stuff like Wally West and Jesse Quick, unless you are able to provide a model!
Also, to port to SFM just extract it with gmad and put the content into SFM's folders, it's common sense.
Sorry for rant but the amount of idiots in the comment section and absolute ignorance of how the guy made the addon just annoyed me.