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If you have a relatively modern Mac (2017 or newer), you should consider upgrading to macOS Ventura or Sonoma to benefit from new features and, most importantly, ongoing security patches.
What (Windows, Mac, or Linux) are you using to host or build this file? macos catalina 10157 iso download new
Search for "macOS Catalina 10.15.7 ISO" on Archive.org. This site often hosts legitimate copies for virtualization purposes.
hdiutil convert /tmp/Catalina.dmg -format UDTO -o ~/Desktop/Catalina.cdr Use code with caution. mv ~/Desktop/Catalina.cdr ~/Desktop/Catalina.iso Use code with caution. When searching for a "macos catalina 10157 iso
Do you also need instructions on how to create a from this ISO? Share public link
Under Storage, mount your Catalina ISO into the virtual optical drive. Search for "macOS Catalina 10
It's common for the installer to seem frozen, especially near the end of the process. This is often due to background processes completing.