I don't have a Mac, but on PC the launcher and game must be on same hard drive in the same folder. Are you installing launcher on the drive with space?
@JasonSilverSpring As far as I can tell this installer is both the launcher and game. So I don't have either, but intend to install all of it onto the same drive if necessary. But as @Plemish stated, the installer only recognizes the boot drive and incorrectly at that. This I believe is something on their end that is just failing to be fixed.
@Plemish do you happen to have Time Machine Backup's running at all, and if so are you using the external or the internal boot drive.
@Plemish I would think this installer would be responsible but when I was working with support (still am) they mentioned Time Machine. So just curious if you were running into that issue. I as well have other games that I have the launchers on the boot drive but the game on secondary.
Experienced the same problem and emptied my laptop of everything possible, including all applications. I had space that the installer failed to recognize, plus a 132 GB external hard drive. I went through the horrific loop of customer service and they just kept suggesting the same "solutions" as if I had not tried them already. I ended up asking for a refund I hope one day they will actually fix this problem
Free space is what we’ve always known it to be. It’s space on disk where there’s nothing, that’s ready to have data poured into it. Purgeable space is different. Purgeable space is a collection of files that are really on disk, ready to be read or modified or added to at any time—stuff like files stored in iCloud, dictionaries you haven’t used recently, certain large fonts (especially of Asian languages) that you may never or rarely use, movies and TV shows you’ve already watched (and are re-downloadable from iTunes), and photos and videos in that are synced with iCloud Photo Library (if the Optimize Mac Storage setting is turned on in Photos preferences).
These are real files, but Apple considers them expendable. They can be deleted immediately, without warning, in order to free up disk space, because they can always be downloaded again later.
Now here’s the big change in macOS Sierra: Apple adds the amount of truly free space to the amount of purgeable space, and that’s what is displayed on your Mac as the amount of free space on disk. As I write this, my boot drive has 51.3GB of free space—and 22.6GB of purgeable space. In the old days, this would be reported to me as 51.3GB free. In macOS Sierra, it’s reported as 73.9GB free.
According to Apple, if I were to try to copy a 60GB file onto my drive, it would just work. The system would work in the background to purge enough stuff to fit my file and keep a decent amount of free space on the drive so that my Mac wouldn’t slow to a crawl, which happens when your disk is nearly completely full.