Ok, I installed the JA Extensions Manager, changed the Service Manager to JoomlArt Updates and logged in.
But when in Extensions Manager> Templates when I click on "Check Update" I see the message:
"Response from JoomlArt Updater Service: Sorry, this extension is invalid, unpublished or no longer supported: listlist_j16.
Please update the service setting or contact with service provider."
How can I solve the problem?