QB Issue Resolution:

make a back up from the file menu, send the back up, he restores from back up after saving it to his hard drive

Resolution for Issue 'How do I send my company file that I have edited to my friend?' available: Yes (Solved).
Source: Intuit Community forum.

How do I send my company file that I have edited to my friend?: 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.

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