QB Issue Resolution:
Yes you can change a QBPOS workstation from Server to Client and back by uninstalling and installing the software. During the installation process, the installation will ask whether the workstation is a Server or Client. This is the most effective way to do what you are asking.
Resolution for Issue 'Can a client change to a server? Can it be changed back?' available: Yes (Solved).
Source: Intuit Community forum.
Can a client change to a server? Can it be changed back?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Quickbooks/QBO
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