I had the same problem. After reading this long list of posts and seeing no attempt to help from the developer, I tried the “right-click and Run as administrator (even though I was logged in on in Win10 as administrator) and that worked for selecting the file. But then I got another error message when it tried to “Flash”. On a second try, it could not see my memory stick. When I removed it and plugged it back in, it saw the stick, and seemed to work. It finished writing and spent a lot of time verifying until it was almost to the end when it returned with the same error message. I didn’t copy the message and now my USB memory stick seems to be nonfunctional. It was almost new.
I’m not very computer literate but I am fed up trying to load Zorin onto my W10 laptop, I’ve followed instructions to the letter in a popular computer magazine, everything worked fine until I had to insert a memory stick and send Zorin to it using Balenaetcher, all I get is an error message saying “error opening source” ERROR:9)’h.requestMetadata is not a function. I have read many comments for a workaround but none work for me. I’m ready for tossing this laptop in the bin so any help would be greatly appreciated. I downloaded Balena today and I am using a HP Pavillion x360 laptop.