Downloading GTRSolo 14.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The application lies within Audio & Video Tools, more precisely Music Production. We recommend checking the downloaded files with any free antivirus. This Mac app is an intellectual property of Waves Audio.
From the developer:
GTR Solo delivers the sound of real amps, cabs, stomps, and mics—in your computer. Just plug in, fire it up, and experience precision models of amplifiers by Fender®, Marshall®, Vox® and others. Then take it to the next level with awesome distortion, modulation, and ambient effects.
These are the same GTR sounds top guitarists, producers, and engineers are using on their most important tracks.
You may want to check out more Mac applications, such as MainStage, Adobe Audition or MelodyneEssential, which might be related to GTRSolo.