Ivan: If your subscription is in force, then you have no rush. The point was for the folks who let their subscriptions lapse (think: early adopters, who purchased ArcaOS 5.0 in May of 2017 with six months included subscription and then never renewed). It's simply not fair to everyone who
does renew on time to have people go three years and
then re-up for another year at a fraction of the cost of a new license. Everyone else is funding development in the meantime. (And frankly, the vast majority of ArcaOS licensees do renew early or on time, probably because we continue to crank out new stuff and we work tirelessly to address trouble tickets. </shameless plug>)
David: That link is correct. There is no 5.0.5 available
today. We plan on a release sometime this month, but that hasn't happened, yet. So, in the meantime, 5.0.4 is the current shipping release, and from your original order page, you may download a decent portion of the updates which have been released to date, but more stuff is coming in 5.0.5. I've been busy in the workshop today, hammering out the last few bumps (I hope; at least everyone else on the team has been waiting on me, today).

Cheers
Cheers