I confirmed the issue. As you correctly assumed, the extension runs some setup processes when it is first started. We will check if we can run these procedures also directly after installation.
One possible workaround is that you use desktop automation (specifically web extension testing) to start and then close the extension once. This can be done by a preinstalled version of UI Vision in either a different browser (Firefox, Edge) or simply a different Chrome profile. Then the procedure would be:
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Use webdriver to install RPA extension
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Call macro in preinstalled UI.Vision (in other browser or profile) to click extension button once and then send XTYPE Alt+F4 to close it again.
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The fresh RPA installation is now ready to run your automation
