Yes. If you are interested in a version of GibbsStudio for a different system please let us know, we are considering to provide it for other platforms.
A trial license can be activated in the license window on the welcome screen. After buying a commercial license, the activation code can be used to activate the commercial license.
No, no need to install anything else. The latest version of PHREEQC is already included in GibbsStudio.
Oops! Please, contact us and we'll try to figure out the problem.