Can't Install or Pick Data Files Destination

[Pretender]

Hey there,

I forgot my external hard drive which has my Hero Lab data files. No biggy, I figured, I'll just install it a second time in my internal hard drives.

To my amazement, though, it seems like the installer has been changed in baffling ways; it doesn't let me pick a Data Files Destination. When I try to install it in the default C drive, it says "Drive or UNC share is not accessible. Please select another drive." Well, gee, if I could, I would.

What am I supposed to do now? I paid through my nose for this and now it doesn't even install any more.