According your download link the last version of Liquid notes available for MAC is version 220.127.116.11, but when I install it, my Liquid notes app still showing old version 18.104.22.168 .. may i know why ? ...
Do i am doing anything wrong ?
This is correct, you are doing nothing wrong.
When releasing version 22.214.171.124 we identified a problem with the installer on some Macs, which got fixed immediately by applying a patch to the installer only. The version built remained unaffected, this is why you still see version 126.96.36.199 being displayed inside the application.
With an update due in some days this will be corrected so that both file name and version number are equal!
All the best,