I probably have a strange request.
I have develop a msi to install two softwares. After the EULA a screen with two checkboxes must come and on selection of either or both of these checkboxes the corresponding softwares have to be installed.
I have used to install a single software earlier never for two.
I would be obliged for any leads.
Windows installer has a concept of "features" which can be selected for installation or omitted. If you have already created a working installer, then you have at least one <Feature> element in your WIX files.
Simply create multiple <Feature> elements and then use <UIRef Id="WixUI_Mondo" /> or <UIRef Id="WixUI_FeatureTree" /> to allow the user to choose which features he wants to install.