Authorized users can log in and access the same QuickBooks file if you have installed the QuickBooks Database Server Manager on your server and authorized users to access your QuickBooks company file. Each separate user must have a valid license to use the QuickBooks software.
QuickBooks Pro provides options to install a multiuser mode for a single person to use on two computers or for multiple users.
Learn in detail and get support service.There is two way to upgrade and install an update to your newest QuickBooks Desktop.To upgrade.
Everything you should know about How to Update QuickBooks Desktop to the latest release version.