Tried again to install under Windows 7 this time. Got further, but it prompts me for email address. I enter it, and it says that it encountered an error that it should not have. (?) No explanation of the error. I have uninstalled. I’m not happy with 7Zip or Peazip, so keep looking for something better. Until they can fix their installation under Windows 10 and 7, this is not it, apparently.