Wrong directroy

Just did a clean install. I downloaded radeon-crimson-relive-16.12.2-minimalsetup-170106_web for automatic detection.

I choose Advance install because I wanted to change install directory from C:\Program\AMD to G:\Program\AMD

After install is done, I have ~700 MB in G:\Program\AMD and 5,5 GB in C:\Program\AMD

 

Why is the installer blatantly ignoring my choice?