you may want to look again. it will work both as http and https on the www.airwindows.com url. wordpress now favours https, and may on comparatively new installations put in support for that by default as long as you have a tls certificate. and pretty much every site has one of those courtesy of let's encrypt (including airwindows.com by the looks of it).
chrome defaults to the https form, which then blocks the downloads if you just click on the zip file's hyperlink. a save-as will download the file but give you a quarantine warning.
similarly, firefox now blocks http downloads from a https main site.
ironically, if you force chrome to load the http site, it will cheerfully download the zip files without complaint - presumably because it shows the "not secure" warning in the address bar. funny old game, isn't it?
if you change the file url to https, they seem to download just fine. so you might want to consider just altering the link addresses with a search and replace in the database or modifying the prefix wordpress uses for content downloads to https. the payoff is google is nicer to you in terms of SEO.
