Updates within a major release cycle are free, so from iClone 7.0 all the way up to 7.9 and beyond. Same with Character Creator.
However, going from iClone 7 to 8 and CC 3 to 4 will be a paid upgrade, usually at around half of the full price.
Traditionally, release cycles of iClone and CC have been years long (iClone 7 was released in 2017), so you get a lot of updates during a release cycle, which is quite a good deal I think.