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Installation failed with error code 0x80070020
The installation fails because you don't have access to write the installation files to the harddrive.
Make sure you have administration rights to the hard-drive that you are trying to install the application to.
How to Install MicroStation as Administrator: https://communities.bentley.com/products/microstation/w/microstation__wiki/13407/how-to-install-microstation-as-administrator