Anyone capable of running cryptocoin wallets should have no problem managing manual installation of them.
Auto-update is a nice "show-off" feature but IMO ultimately pointless.
I myself at least prefer manual upgrades
well you see, with the latest installation you will have a choice to turn off the auto-updating or keep it on (set to on by default).
The standalone client is more of a classic or full manual client that has not yet been configured for the new features or in reverse, the new features configured to run dynamically through a standalone client. Hence the installer will still be a required thing for the next couple of updates.