QB Issue Resolution:

Copy the company file and move it to the documents folder on the new computer, install QB 2019 open and update your company file.

Resolution for Issue 'Quick books 2015 for Mac, open the software and many windows load (check book, payments, invoices, estimates…) but all commands are greyed, not black and do not work.' available: Yes (Solved).
Source: Intuit Community forum.

Quick books 2015 for Mac, open the software and many windows load (check book, payments, invoices, estimates…) but all commands are greyed, not black and do not work.: 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 check book
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Error Recovery for check book [Canada]
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