Official scripts for Comodo Client - Security use a file named update.7z hosted on their servers to deliver binary updates to Windows systems.

Variable (Legitimate if from trusted software; high risk if found in unexpected directories) Update 7z binary and License.txt #39 - GitHub

Application binaries, DLLs, configuration data, or license files

Legitimate update binaries inside the archive are often digitally signed by the software vendor.

Given that attackers use this generic name to hide malicious payloads, always scan the file with an antivirus or upload it to a service like VirusTotal before attempting to open it.