I change the default directory from C:\Program Files\Starcraft II to C:\Games\Starcraft II and then scroll down and click accept.
It then gives me the error message:
Could not install.
Invalid installation options. Please try again.
I have tried changing the directory back to the default location and restarting the installer.
I had WoL installed previously but after being unable to update it for the last 5 days I have uninstalled it so as to use the fresh install from the HotS disk.
I have temporarily disabled my anti-virus and am only running Firefox.
Can I ask how much disk space you have free on the hard drive you're using to install to? I'm also wondering if you have a second hard drive you can test installing to? It may be worth testing the install there instead of the location you're trying to currently use.
If that doesn't help, then restarting into a Selective Startup may allow the installation to proceed:
Let us know if you still can't install after that.
If it comes to it, i'll download it from the blizzard downloader, and attempt to install it from that, to see if that works, but that is a last resort as my internet speeds aren't very quick and would take most of the day to complete.
Most of the problems I have read about are related to Diablo 3, which I didn't have a problem with.
Further advice of the matter would be appreciated.
I renamed mine to "Starcraft II WoL" for example! but all names are good!