QB Issue Resolution:

I suspect you’ll have to regenerate it in layout designer, custome templates do not transfer between the desktop platforms either.

Resolution for Issue 'Estimate layout transfer from online to desktop' available: Yes (Solved).
Source: Intuit Community forum.

Estimate layout transfer from online to desktop: 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 Desktop
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