QB Issue Resolution:
2019 seems to have these types of problems. See if this helps.
Resolution for Issue 'QB Desktop 2019 crashing when opening legacy file from QB Desktop 2010' available: Yes (Solved).
Source: Intuit Community forum.
QB Desktop 2019 crashing when opening legacy file from QB Desktop 2010: 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 legacy file
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Error Recovery for legacy file [Canada]
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