Some community tools (like PowerBIDesktop.exe /quiet or extractMSI ) allow you to extract the MSI contents to a folder. While you cannot run Power BI from that folder, you can copy the extracted setup files. When you arrive at a client site, you run the local installer from your USB (requires admin rights but saves downloading 500MB over slow client Wi-Fi).
You author or upload your .pbix file to a Power BI Workspace (Premium or Pro license required). You can then edit reports using the Power BI Report Builder (for paginated) or the online edit mode (limited compared to Desktop). Power Bi Portable Version
However, by reframing your requirement—from "portable app" to "portable environment"—you have several viable paths. A bootable USB drive with Windows To Go gives you native performance. A cloud-hosted Virtual Desktop gives you flexibility. And the Power BI Service gives you universal access for viewing and sharing. Some community tools (like PowerBIDesktop
If you absolutely, desperately need a click-and-run solution for a locked-down laptop, use the Power BI Report Builder (for paginated reports). It is significantly smaller, has fewer dependencies, and some users have reported success running it from a portable Apps folder—though this remains unofficial and unsupported by Microsoft. You author or upload your