1. If i buy the $18.00 one do i have to buy the next version,next,next,ect.?

2. same question as 1 except with $39.00 one.

3. If my activation key thing doesnt come in or doesnt work do i have to buy it again?

4. Can i unregister key thing?

1. You get all the later builds for the price of the current one. Buy now, its cheaper.
2. Support edition may have some benefits, but they are unknown at the moment.
3. Just email Data to resend it, and he'll do it.
4. Yes, you can unregister the game, but you cant have your money back if that is what you meant.

q:1

so should i buy regular 18.00 or the full 39.00 right now??

Its your choice, if you want to support Data, buy the costlier support edition.
If you just want to play the full game, buy the cheaper one.

You will be able to play all the later builds with either one.

ive got one more question, how long does it take for the key to get to my e-mail or whatever if i use credit card?

It depends.

For some/most people, it's basically instant, or within fifteen minutes.

For others, it's taked up to a few days, but that's uncommon.

ok that should be it, thx kallemort and grif