: If you need to add more users (up to 30 for Enterprise versions), you must purchase additional seats through Intuit's official channels to ensure your license remains valid and supported. QuickBooks Important Note on Older Versions
If you need to support 30 users legally, Intuit provides official paths: Add a user license to your QuickBooks software - Intuit : If you need to add more users
Versions from 2013–2016 are no longer supported by Intuit, meaning they do not receive security patches and cannot access online services like payroll or bank feeds. Legitimate Multi-User Options : If you need to add more users