My C drive is a small SSD drive on which I keep only my Windows install. I'm trying to install the (trial version of) Flash Builder 4.6 on my D drive, and while it seems to accept the correct install location, it fails with an error code 30 and refuses to install Flash Builder. The troubleshooting details say that the C drive doesn't have the necessary 1.7gb of space (which is true, it doesn't), however it shouldn't be checking the C drive at all - the D drive has more than enough space. I've tried search for answers to this and can't find anything; poking through the extracted files and manually changing all their .xml files to use a D drive install location does nothing and I can't find a preinstalled/preunpacked version. I'm running Windows 7 Pro 64bit, for what it's worth. Any help would be greatly appreciated.
As an unrelated (I think) side note, the default install location is always "C:\Program Files (x86) (x86)\Adobe" - and yes, the (x86) being there twice is not a typo.
I faced the same problem today, only 1GB was free on C: and I couldn't free up anymore. The solution to download 7-zip, right click on FlashBuilder_4_7_LS10_win64.exe, choose 7zip and then extract to a folder.