Can a user install just the Comodo Sandbox Container without having anything else installing?
He is basically looking for a Sanboxie like containment that's not sandboxie.
No, you cannot install only Comodo Containment.
Comodo Secure Shopping is a suitable alternative. Unfortunately, the installer's digital signatures suggest it has received no updates since August 2019. Secure Browser and Secure Desktop are part of Comodo Secure Shopping, resembling the virtual browser and virtual desktop in Comodo Firewall. With its secure desktop, you can run browsers and programs virtually.
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I tested Comodo Secure Shopping on my Windows 11 23H2 (OS build 22631.3593), and it worked well. It installed smoothly, and Chrome and Firefox ran virtually with no issues. I had no issues running all my installed and portable programs in the secure desktop environment. I'm unsure about the effectiveness or compatibility of the containment technology with the operating system. Overall, it's a useful product, and I hope they update it or release a new version similar to Comodo Firewall.