QB Issue Resolution:

Next step will be to buy an additional license for each client workstation and install QB2019 on each workstation as client. If your server does not have QB2019 installed you will have to designate one as the admin. Once all are set up you can turn on multi-user in the main database.

 

All you need is here> https://quickbooks.intuit.com/community/Help-Articles/Set-up-multi-user-network/m-p/203684

Resolution for Issue 'some basic Questions about installation of Quick Books 2019' available: Yes (Solved).
Source: Intuit Community forum.

some basic Questions about installation of Quick Books 2019: 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.

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