You now have a brand new, official macOS_Catalina_10.15.7.iso on your desktop. Size: approx 8.5GB.
If you are currently on a Mac, you can download the full installer directly from the Mac App Store. This is the most secure way to ensure the file is untampered. App Store Link: macOS Catalina page in the Mac App Store. System Preferences: Once you click "Get," your Mac will open Software Update in System Preferences to download the ~8GB installer. Terminal Method: macos catalina 10157 iso download new
While this guide focuses on Catalina, you might be interested in the latest and greatest version of macOS. Here is how to find the most recent versions of macOS: You now have a brand new, official macOS_Catalina_10
If you don’t have a Mac to create the ISO, you might turn to third-party websites. If you do, follow these : This is the most secure way to ensure the file is untampered
Do not trust a "ready-made" ISO from a random blog. The term "new" in your search likely refers to a clean, untouched copy. The only way to guarantee that is to use the and convert it yourself using the Terminal method above. It takes 30 minutes, but you will have a perfect, malware-free ISO that works on VirtualBox, VMware, and Proxmox.
Generally, no. As an unsupported operating system, it lacks critical security patches for vulnerabilities discovered after 2022, making it risky for everyday use and especially for handling sensitive data.