Desktop App: Fix the installer.
First and foremost. Allow us to choose where to install this app. In today's market, SSD's are much cheaper and storage more readily available. I think it's safe to say most users have multiple internal drives.
I'm well aware we can "force" this program to install in a different drive using CMD prompt or a Run line. However, I think it's just bad form not to have this built into the installer.
Secondly, make up your mind on how much space it will take. When I try to install with less than 21gb of free space it will tell me I need more than that amount. However, when I install with more than 21gb it tells me I only need 13gb of free space. Finally, in my experience, while downloading the program it told me it was only downloading 7.6Gb yet actually downloaded closer to 10Gb after freezing at 7.2 for about half an hour.
This installer is embarrassingly bad and leads me to have no faith in your platforms software at all. As such, I refuse to purchase any software items from Oculus.
Please, do some work on that terrible installer.