I will not rewrite the topic so...

http://steamcommunity.com/app/282440/discussi...234688618/

Here you have a link for downloading a ZIP. It has instructions and all the necesary stuff to change map formats.

https://onedrive.live.com/redir?resid=901044A...file%2czip

Reference:

http://www.quake3world.com/forum/viewtopic.php?f=10&t=51522