Note: When using Android 6+, some browsers and file managers
have problems launching APK files. For instance, the Chrome
Downloads window, and Astro File Manager. If you encounter
issues launching the APK, try a different file manager,
such as 'My Files' on Samsung devices, or 'File Manager'
by ASUS (available in the Play Store).
GammaGuard Installing Instructions
In your devices settings, find and enable the option to install apps from unknown sources. This will likely be under the category of Security or Applications.
Click the link above to download GammaGuard to your device.
You may be prompted with a security warning. If so, click OK to download the file.
If you have previously installed GammaGuard and are downloading this as an update, you may be prompted that the file already exists. If so, click replace file.
When the file has finished downloading, click the download complete notification. Alternatively, using a 'downloads' or 'file explorer' app, find and click on the APK file.
An automatic installer/updater will be launched.
Clicking install will then complete the install/update process.