Anyone kow how to convert 2.x-3.x maps to 1.0?

Just update all of your entities.

Make sure you have info_observer, info_doddetect, env_light, and both the allies and axis info_players

... anf note that some model/sound locations have chnaged so you may need to update thse in the relevent entities.

Don't forget: you would need the author's permission to do this....

I was going on the note he meant his own maps, hmm...

If you want to do others maps, think again. They are not your work and you would need to permission to do so. In which you most likely won't get, no mapper is gonna let some kid update their map.