Screen Tool installation instructions:

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Windows:

Run msi package and installer will do the rest. If you are installing plugin(s), just copy plugin dll file into program folder.

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MacOSX:

Mount dmg file and copy ScreenTool into Applications folder on your Mac.

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Linux:
 
For static build there is no installation needed: just copy file where you want it and run it.

For tar.gz file you need to untar content of file where you want your Screen Tool to be and run install.sh script. Then you will have desktop link in same folder which you can copy to your desktop to run Screen Tool. If you want to run it from terminal use stool.sh.