The old beta version is what the getflash10 would be for TC 1.x. I recommend just using flash 9 with TC 1.x.
obviously there should only be so many versions in the 1.x repo as work for 1.x. i realize there is a beta version that should work in 1.x... but for something used by as many people as flash, when there is no way to modify or redistribute the plugin itself anyway, i would prefer that both versions 9 and 10 be available, instead of just 10. by the time flash 17 is out this may no longer be sensible, but i suspect there will be people that want or need flash 9, in 1.x or 2.x, and it's only a download script after all.