I'm using Windows 11. Yes, the offline installer file is on my PC as it appears it doesn't let you know it is downloading, Since it is a zip file I downloaded WinZip to open it but it won't and it gives me a message about scripts and says it needs to close. I'm going to submit a ticket and ask if they can link me to the unzipped file and if they won't I will request a refund. If they sell a product for this price it should be of merchantable quality.
Edit* I tried downloading the online installer again and it has worked so hopefully I should have it in 20 minutes.