Service packs can only be installed on the same version. You indicated that the service pack you were attempting to install was for 9.0D, and the currently installed version is 9.0C. This is why you are receiving the error.
The solution is to download the upgrade for Ledger 9.0D (which will include the service pack changes). Whenever you want to install a new version of an Adagio program where the version number will change (ie 9.0C to 9.0D), an Upgrade is required.
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Regards,
Softrak Tech Support