Hi,
1.)
To select language during installation, you have to click Customize button and then set options in Languages group.
2.)
I cannot comment your information.
3.)
You need administrator rights to save the files.
Try this trick:
- save parametric.psf in your personal directory
- copy parametric.psf from your personal directory into ...\Parametric\bin directory
Note: You can also launch Notepad using right-mouse-button command Run as Administrator and then edit parametric.psf file from ...\Parametric\bin directory
MH
1. The option to install language is there:
You get there through from the window where you select installation path and applications to be installed. You need to click Customize in upper right corner, and then select PTC Creo Parametric.
3. I assume you've installed Creo into default location, which is Windows' Program Files folder. It's write protected and you need to elevate your user rights to administrative to be able to edit files there (even if you work on account with administrative privileges). To edit a .psf file located in Program Files folder, find Notepad application in menu Start, right-click it and select Run as Administrator, then use File > Open (and set filter to All Files), browse to .psf file, make changes and save the file.
OK, I missed it the first time when you said you're using Schools Edition, what Martin and I were talking about applies to commercial edition installer; apparently Schools Edition uses modified installer.
In your case I would just try to add the variable Martin already posted to the .psf file (using whichever method suits you to battle Windows access protection 
) and see if it changes Creo's interface language.
