The programmers of the Service Pack recommend to install this package "in clean". This means that Flight Simulator X should not have installed Add-Ons or packages of third.
According to Phil Taylor, some programs of third can cause conflicts or their files can be overwritten by the SP-1, should reinstall the Add-Ons in question.
To avoid this problem he seeks advice to execute FS-X manually from the line of commands or uninstall all the Add-Ons, to install the Service Pack 1 and then install the Add-Ons one by one again.
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