Well, these days believe me, everyone have it... even if someone doesn't have it, they visited some Flash sites at least once in their life, and it was required to have Flash player installed... so they had to download it in order to see the contents... anyway, flash player is free for everyone.
Yes, it's possible to make that animation slower but then again... animation will be "jumpy", not smooth like it is now... that's just because I tried to save some memory by using less number of total frames. Less frames = jumpy animation, less frames with higher FPS (frames per second) = smoother animation... good number of frames and great FPS (at least 24 pictures per second) = amazing snimation..
Cheers !
EDIT: Also there are some freeware utilities that will turn those two files into just one large scr file. That way no flash player is required... it's just I can't find those utilities any more... no matter how hard I search, no trace of them any more... and I don'ty even remember the name...