So there I am, wanting to install Photoshop on my laptop, which happens be a Mac with Leopard installed when I see this lovely message:

So what does “This software cannot be installed because the file system of the OS volume is not supported” even mean???!?! I tell you what it means, it means that Photoshop will not run if you happened to have formatted your file system to be case sensitive. Thanks for the clear error!
I don’t even want to begin on how insane that sounds to me? So what’s a person to do?
Well, my friend James Gibson suggested that I install Photoshop in Windows and use Photoshop through WMware. Another possibility is to rename directories to make CS3 work.
I think I’m leaning towards the first option as some people are having some issues with the renaming method. Either way, it’s kinda lame.
April 25th, 2008 at 11:13 am #Sam
Just install in in a DiskImage that isn’t case sensitive and mount that thing when you need photoshop.
Sounds easier than VM Ware to me and definitely lighter on resources.
April 25th, 2008 at 9:58 pm #K. Adam Christensen
Ohhhhh….that’s a good idea!!! I will have to test that out.
May 13th, 2008 at 6:44 pm #Mark
This issue happens when you’ve formatted your disk with HFS+, Case Sensitive. I like the solution above since it doesn’t requireyou to wipe your drive clean
It’s on the Adobe bug list.
May 16th, 2008 at 12:04 am #Tim
First of all, Adobe, this is ridiculous! Even putting other issues aside, there’s a lot of user benefit to not having to reformat one’s hard disk.
Maybe I’m missing something, but the message is talking about the OS volume, not the install volume, and comes up before you have a chance to choose where to install meaning you can’t choose to install on a diskimage unless you somehow make it the startup disk. So, am I misunderstanding something?