Installation:
1. Browse to your x4 folder
2. Create a new folder named 'extensions' if you haven't already
3. Unzip the folder 'BetterScanColors' into your extensions folder

Folder structure should look like this afterwards.

X:\YourPathTo...\X4 Foundations\extensions\BetterScanColors\
X:\YourPathTo...\X4 Foundations\extensions\BetterScanColors\content.xml

X:\YourPathTo...\X4 Foundations\extensions\BetterScanColors\libraries\
X:\YourPathTo...\X4 Foundations\extensions\BetterScanColors\libraries\parameters.xml

Uninstallation:
1. Delete the 'BetterScanColors' folder. It shouldn't leave any footprint in your save.