QB Issue Resolution:

In QuickBooks Desktop, accessing a company file in different versions isn’t possible. Once company file is being updated to a higher version (2019), you can no longer open it in the older version (2018). Having multiple users in different computers is only applicable within the same versions.

 

To learn more about multi users in QuickBooks Desktop, please check out these articles:

This should keep you moving today, @mikey123.

Resolution for Issue 'Multiple users with different versions QuickBooks 2018 and QuickBooks 2019' available: Yes (Solved).
Source: Intuit Community forum.

Multiple users with different versions QuickBooks 2018 and QuickBooks 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.

Support for Company File
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Error Recovery for Company File [Canada]
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