Hi @Anonymous ，
Unfortunately, I can’t reproduce the same issue as yours.
First, you should make sure your data connection mode of this pbix file is not “Live connection” then check the important considerations and limitations associated with downloading a .pbix file from the Power BI service:
- To download the file, you must have edit access to the report.
- The report must have been created by using Power BI Desktop and published to the Power BI service, or the .pbix file must have been uploaded to the Power BI service.
- Reports must be published or updated after November 23, 2016. Reports published earlier aren't downloadable.
- This feature won't work with reports and content packs originally created in the Power BI service.
- Always use the latest version of Power BI Desktop when you open downloaded files. Downloaded .pbix files might not open in non-current versions of Power BI Desktop.
- If your administrator has turned off the ability to download data, this feature won't be visible in the Power BI service.
- Datasets with incremental refresh can't be downloaded to a .pbix file.
- Datasets enabled for large models can't be downloaded to a .pbix file.
- Datasets modified by using the XMLA endpoint can't be downloaded to a .pbix file.
- If you create a Power BI report based on a dataset in one workspace and publish to a different workspace, you and your users won't be able to download it. The download feature is currently not supported in this scenario.
https://docs.microsoft.com/en-us/power-bi/create-reports/service-export-to-pbix#limitations-and-cons...
Similar error code when download pbix file reason is incremental refresh report,and refer:
https://community.powerbi.com/t5/Service/I-can-t-download-my-report-in-pbix/m-p/1461011
Best Regards
Lucien
