Quote from Margatron
I got it off this site, which is not down at the moment:
Ello! My name is PumaGator and I own Variant Minecraft. Just PM me for the IP!
I know this is a very old thread, but its still relevant, and I managed to get the file to get the program working.
I got the file from the wayback machine website, but I created a link to the file on google drive: skinedit2.jar
If you don't trust this file you can get it from the wayback machine website yourself.