If you encounter a Rhino 8 installation failure and the final error code shows as Redist_MSWebView2_Standalone:-2147219198, here's how you can resolve the issue…

The installation hangs for a long time on the “Installing Microsoft Edge Updated” screen before failing.

And the main error appearing in the installation log file is as follows:

• [1408:0D58][2024-08-12T10:24:57]e000: Error 0x80040902: Process returned error: 0x80040902
• [1408:0D58][2024-08-12T10:24:57]e000: Error 0x80040902: Failed to execute EXE package.
• [4AD8:4ADC][2024-08-12T10:24:57]e000: Error 0x80040902: Failed to configure per-machine EXE package.
• [4AD8:4ADC][2024-08-12T10:24:57]i319: Applied execute package: Redist_MSWebView2_Standalone, result: 0x80040902, restart: None
• [4AD8:4ADC][2024-08-12T10:24:57]e000: Error 0x80040902: Failed to execute EXE package.
• [1408:0D58][2024-08-12T10:24:57]i351: Removing cached package: Redist_MSWebView2_Standalone, from path: C:\ProgramData\Package Cache\BBCEF5847FAC589E7205DF908E819EA0DF803CBA\

This issue is caused by your current Windows being unable to properly install MicrosoftEdgeWebView2RuntimeInstallerX64.exe. Please open Windows File Explorer, go to C:\Program Files (x86)\Microsoft, and ensure that all files (including protected system hidden files) are visible. Locate and delete the three protected system files: edgecore, edgewebview, and temp. Afterward, restart Windows and reinstall Rhino 8.

Since these three files are part of the Windows system and cannot usually be deleted directly, you will need to use some powerful deletion tools to remove them. I recommend using DiskGenius, For more details, please check here. 👈