I used the Offline Installer wlsetup-all.exe from the link at the bottom of this archived page on the Wayback Machine. Don't try installing anything else from Essentials 2012, just Movie Maker/Gallery. You may see an install error reported, if so just ignore it. Look at your Start menu when done and it should be installed and working.
I also have W7 Pro on my System Two, and several W7 Hyper-V VMs. My other machines run Windows 10/11. Their specs are in my Ten Forums & Eleven Forum profiles.