WIX Installer: How to keep previous revisions of same application installed

Question

I installed a revision 1.0 on my system and after some time I make some changes and change the revision to 1.1; Now when I install the revision 1.1 of the application it asks me to remove the previous revision of the application.

How I can instruct WIX that it should keep my old revision installed and install the latest revision without any error?

Answer 1

As long as you are using simple Upgrade logic, (eg the MajorUpgrade element is great), you only need to do two things:

1. Change your Product/@Id guid. That will tell the Windows Installer that you have a new issue of your product.
2. Change your Product/@UpgradeCode guid. That will tell the Windows Installer that this product is in a new "family".

Now when you install v1.1 it will leave v1.0 alone and you should end up with both entries in the Add/Remove Programs.