I moved this into a new topic because it is unrelated to the How-to and the GlassWire team would have to change their site to fix this issue.
In the interim, can you try this link direct to the installer download:
I understand that you are saying that you use a Mac web browser. When you try to download the GlassWire installer, glasswire.com is automatically redirecting you to the Mac download page (https://www.glasswire.com/download/?os=mac) based on your web browser's user agent. No Mac version has been released so there is no Mac download and there is no download link for the Windows version either, only a link to the Windows download page. I assume that you are again redirected to the Mac download page.
If I've got this wrong then I apologise in advance.