MC 18 updates, v158 to v183, for example, are all free of charge.
The .mjr file you have downloaded will remain valid for 14 days from its generation date.
You are allotted 10 mjr generations per year.
If you genuinely run out of restores, post here and request more (In a new thread) and someone from JRiver will investigate and supply, normally well within 24 hours. Never post your registration code in the forums.
Once registered, on a system, MC should retain that license on that system unless you reinstall Windows or restore a registry version from before the license was applied.
Under some circumstances, MC will discard its license and require a restore. The most common cause of this is if the PC name is changed, otherwise, once registered, you shouldn't really have any troubles going forward.
-marko.
