QB Issue Resolution:

Can you use WebConnect for this data instead? (Download a “.qbo” file). It is a much better format to use. Also be careful – if your iif file failed half way through you may have data entered in an indeterminate state (a backup is automatically created when importing iif).

Resolution for Issue 'I created a .IIF file from my bank and have attempted multiple times to import an I get this error continuously and have to do a Force Quit to get out of it. “An error occurred while making your changes.”' available: Yes (Solved).
Source: Intuit Community forum.

I created a .IIF file from my bank and have attempted multiple times to import an I get this error continuously and have to do a Force Quit to get out of it. “An error occurred while making your changes.”: 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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