support MSI minor upgrades

Optionally support 4 component versions for installer, a.b.c.d .
Current installation is not prepared for this, it only relies on MSI major upgrade to replace all files in package. MSI major upgrades do not work with 4 components, ProductVersion is limited to 3 places, anything else is ignored.

So we need to work with ProductVersion unchanged, which means MSI minor upgrade, and here file versioning rules https://docs.microsoft.com/en-us/windows/win32/msi/file-versioning-rules needs to be followed.