My suggestion would be to reset the date on the computer to a time in the past when the certificate was valid, install El Capitan, and when you're up and running you can reset the date to the correct date. The installers were re-signed in 2019 to last until 2029, but if you've bought a USB from someone, it's entirely possible it's a pre-2019 image and has the expiry issue. Without knowing the exact error, it's hard to be 100% sure, but El Capitan was one of the more frequently twitchy installers in my time doing USBs. What's happening is the computer date is past the certificate expiry, and it throws an error. This sounds a lot like the installer certificate has expired. I used to provide USB installers for old macOS, including El Capitan. Two options to try here: bodge the date, or get a new installer.
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