The installation packages are unmanaged packages that contain the static resources, Visualforce pages and the Find Address buttons. Installation packages are available for different editions of Salesforce Classic.
If you have SalesforceIQ Starter edition or Salesforce Group edition, visit this URL to install the package for Leads, Accounts and Contacts into your organisation:
If you have Salesforce Professional edition or higher, visit this URL to install the package for Leads, Accounts, Contacts, Orders and Contracts:
Note: If you are installing into a sandbox organization please visit one of these URLs instead:
or, for Professional edition and higher: