If I bought meet your maker, will it still give me the rewards from the crossover from ages ago?
It should, yes. I don't think there was a time limit.
I have DbD but i never got giving the blocks and props in MyM. I wasn't a big fan of DbD and didn't play it much is this why i didn't get them ?
Yes you should! The cross-promotion is indefinite. So long as you own both games on the same platform, you should receive the rewards. If not, please reach out to support!
-Brandon, Community Manager