Instead of checking the GMG website, downloading a setup, and manually install it, there is now a very easy way to ensure that GMG ColorPlugin is always up to date. When you start the GMG ColorPlugin extension, an arrow down button will be shown in the plugin panel if a new version is available.
You can simply click the Install button to start the download and subsequent installation. All required resources will be downloaded automatically via the internet. Please follow the link for more information: Update GMG ColorPlugin to a New Version
Select the option Open using Rosetta for Adobe Photoshop in the MAC OS settings before starting Adobe Photoshop.
Please follow the link for more information: System Requirements