Seek out @Big Red Consulting on this site. There are apparently ways to convert your data into something that can then be converted to Pro
https://community.intuit.com/users/629178-big-red-consulting

Resolution for 'converted to Pro issue: 'Is there any way yet to migrate from enterprise solutions to quickbooks pro?' available: Yes.

The converted to Pro 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 converted to Pro issue yourself by looking for a resolution described in the article. If it is a complex converted to Pro issue or you are unable to solve the issue, you may contact us by clicking here or by using other converted to Pro support options.

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