You need to check what version of the Marketo Solution you have installed in your Dynamics CRM environment.
Navigate to the Settings section of Dynamics, and then to the 'Solutions' menu.
Under the 'Solutions' menu there is a list of all installed solutions called 'All Solutions', and once you have located the Marketo Solution in there, its version number will be listed in a column beside its name.
Who This Solution Applies To
Users with Microsoft Dynamics integrations.