Game Launcher was still working but the Installer was broken, i've just uploaded a fixed Installer and it should now work
Downgrade Patches may come but no promise, if i update them it will be after no more hotfixes are in sight because i would have to update them everytime a new Terraria Update releases due the way how they work
Edit:
> 130000 Downloads (according to Mediafire)? wtf
So you might not update the downgrade patces at all?