As JohnC_21 hypothesised above, v7 Free release should be made available after the v7 paid release has settled down.
I can't find it now, but I'm fairly sure I've seen a post from a Macrium employee stating that the v7 free edition will be made available "a couple of months" after the paid release.
Probably not a bad thing as the improvements are small and the initial releases are having a few teething issues (the the Macrium support forum). Having said that they are being super-speedy about addressing the issues. Since v7 paid release late on the 27th, they have released two patches already (the second one including a fix for a non-critical GUI annoyance that I'd reported just 34 hours earlier).