Applies (at least) to 6.0.0 and 6.1.0:

To Suppress the UpdateDialog at first start you can edit the File:

XenCenterMain.exe.config in the INSTALLDIR Directory.

Just set this:

            <setting name="SeenAllowUpdatesDialog" serializeAs="String">
                <value>True</value>
            </setting>

and

            <setting name="DoUpgrade" serializeAs="String">
                <value>False</value>
            </setting>

You can save the File with the following Name "XenCenterMainCONFIG", pack it into a .cab File and then you make a Transform to the Original MSI.

In the Transform in the Media Table you set the new .cab File and add 1 to the LatestSequence

In the File Table you update the apropriate Row with the new Sequence Number.

Then you update the MSIFileHash Table with the right Values (you can generate the Hash with tools in the SDK or use add the file to a dummy WISE Project and get the Values from the Table inside the .wsi)

Save the Transform and you are happy.

Cheers

Reto