QuickBooks Online has recently improved their offerings to match up more closely with the desktop edition. Now with inventory management in addition to payroll, taxes, and more basic accounting functionality like invoicing, sales receipts, expense reporting, etc., it's hard to imagine a use case for a small business that QuickBooks Online couldn't handle.
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A license needs to be changed without uninstalling the software. To change a license number from a disabled number to an enabled one without uninstalling and reinstalling, run a repair installation of Point of Sale.
You will be prompted for license numbers during the process. Ow to change a license number: If this solution does not resolve the issue, you can read discussions and post messages and questions relating to your issue on the Intuit QuickBooks Community site. You can also review other available QuickBooks Point of Sale support options for additional guidance.
Here is a link that tells you how to repair your installation of QuickBooks POS.