What version of the SDK did you use to develop the plugin? If you used the Acrobat 11 SDK, then it can only be used with acrobat 11 and later. For Acrobat 10, you would need to develop with the Acrobat X SDK and then it would work with X and XI.
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What version of the SDK did you use to develop the plugin? If you used the Acrobat 11 SDK, then it can only be used with acrobat 11 and later. For Acrobat 10, you would need to develop with the Acrobat X SDK and then it would work with X and XI.