QB Issue Resolution:

Yes, if you can get the 3rd license and the new pc can get to the network where the data file resides, it will work in multi user.

Resolution for Issue '2 licences. Co. file resides on #1. #2 has been replaced by #3. How do I move the pgm from #2 to #3. and continue to access the file via MS Homegroup network.' available: Yes (Solved).
Source: Intuit Community forum.

2 licences. Co. file resides on #1. #2 has been replaced by #3. How do I move the pgm from #2 to #3. and continue to access the file via MS Homegroup network.: 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 access the file
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