Hi,personally one thing I hate are the Newsletter popups, the bigger they are and the more annoying and invasive they are, in this case they can't even be closed :-)
This happens on macOS 10.14.6 with any browser
There was a bug in the script, now you can close the pop-up.
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it seems that now the popup no longer opens ...I emptied the Safari and Firefox cache, reload the page but the popup window no longer appears.
I am available to do further tests.
Finally, I removed the popup from the blog page; I think it's enough to have it only on the download page.