Quick-and-dirty install instructions:
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Simply extract it to an empty directory (e.g. right-click on the zip file and
click on "Extract to ...\mq-watervis"). Then, run 'install.bat' (double-click
on it). It will now ask you for your Quake dir - enter the full path, e.g.:

c:\game\quake

You will then be asked if you want back ups - type 'y'(yes) or 'n' (no). Now
press a key to begin patching. Depending on the speed of your computer, the
patching can take up to 10 minutes.