Unable to install PS CS6 on notebook; no problem installing it on iMac; both had existing CS5 version. Support Advisor finds no problem with installer. Uninstalled beta version of CS6.
Just out of curiosity is the notebook MacOS as well? Only the Creative Cloud versions will allow you to install to Windows and MacOS, the perpetual license versions are for either MacOS or Windows.
Guessing this isn't the problem though if support have already looked into it and you already had CS5, any particular error message you get?