On Computer 2, open EndNote and create a new library.
Start sync by clicking "EndNote Web sync"
On Computer 1, open the EndNote library you want to sync and activate Sync by entering your EndNote Web/Online account details in the "Edit"> "Preferences"> "Sync".
Before you go ahead and set up the sync, create a backup copy of your EndNote library.
Please check the movie clip before you do the following: The movie clip " EndNote Sync: EndNote X7.1 and Later" shows in a good way how to get started with sync on multiple computers. Sync your EndNote library between different computers with EndNote Online If you have EndNote installed on multiple computers, you can sync your EndNote library between the computers with EndNote Online. By setting up sync between EndNote and EndNote Online (EndNote Web), you can access your references online.
With EndNote references are saved locally on your computer.