...
Install the Send2CRM Essentials Salesforce package:https://login.salesforce.com/packaging/installPackage.apexp?p0=04tDo0000000ziwIAA
Send2CRM Connector on AppExchange
We recommend installing the package for admin users only. The necessary permissions can be easily applied using the included permission set.
...
Advanced, Advanced Plus, Enterprise
After installation of the Essentials package above, install the Send2CRM Analytics package:
https://login.salesforce.com/packaging/installPackage.apexp?p0=04tDo0000000zirIAASend2CRM on AppExchange
Again this should be installed for admin users only. The included permission sets should be assigned after installation.
...