I have installed major upgrade successfully but it also allowing another previous version install in wix?

Your problem is the how the comparison of versions is done in MSI by default - 1.0.0.123 is treated the same as e.g. 1.0.0.33. You either have to increase your revision version to make the installer detect this as an older version or use a workaround.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.