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I had this same error. We had to do a couple things to finally get it installed correctly.
First, you have to run Alteryx as an Administrator. To do this, right click on Alteryx Designer and select "Run as administrator".
Then once you have Alteryx open, select the open workflow button in the top left and open the BigQuery .yxi program that you downloaded. You should see the following window pop up. Make sure you have "Install for all users" selected, then hit "install".