QB Issue Resolution:

I feel bad to give you this help article. Lots of steps: https://community.intuit.com/articles/1197814-error-h101-h202-h303-or-h505-when-opening-your-company-file

Resolution for Issue 'Can’t open a backup copy of my company file that my accountant has sent back. It’s a simple restore backup procedure but I get the H505 error every time. Not on a server' available: Yes (Solved).
Source: Intuit Community forum.

Can’t open a backup copy of my company file that my accountant has sent back. It’s a simple restore backup procedure but I get the H505 error every time. Not on a server: 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 backup procedure
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Error Recovery for backup procedure [Canada]
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