Once you got the demo, make a bat file with this in it in your Q3 directory, and place a shorcut at your desktop if u want:
quake3.exe +exec democycle.cfg %1 %2 %3 %4 %5 %6 %7 %8 %9
Then make and edit a file called democycle.cfg with this written in it:
timedemo 1
Set D1 "demo torture1; set nextdemo vstr D2"
Set D2 "demo die; set nextdemo vstr D1"
vstr D1
Where "torture1" and "die" are the demos on my cycle.
This will altern the two demos.
Saludos a todos