I have to say, I'm not a fan of the "4 download attempt limit".  I'd much prefer to see a "Download Library" setup like Daz is using now.

After all, if the connection hiccups or something, that's a wasted download.  And what if a hard drive crashes and you're forced to rebuild your runtime from scratch? That would be very discouraging, to find you have to purchase everything all over again:

"crap, the connection barfed!" wasted download

ack!  someone tripped a breaker! wasted download

grr!  someone unplugged the router! wasted download

successful download

ack!  a hard drive just conked out!  now I have to redownload everything all over again "no more downloads available" cries

 

This might be a little extreme, perhaps, but I hope my point is made.