It should. A few people have moved from one version to another without issue. Though you may want to back them up first just to be safe. But yeah. All versions of the game use the same save system so you should be good.
I don't know what Humble's deal is. I know it's frustrating to everyone waiting... They really don't have a great track record with this stuff at this point. It seems like more often than not they put stuff up in the middle of the night California time... ...and this time they didn't even do that. Not sure if there's some sort of issue or what. Fingers crossed it updates soon.
I've a funny feeling that this might be relating to their Monthly Bundle release in the next hour or two. They might be prioritizing that instead of DFC.