Seeking Help to Import Old Website into Relume Tool

Afternoon folks, I am striving to import a very old web site into Relume, which errored out and referred me to this path to gain insight. Granted the site, which is (https://www.emhinternational.com/) is quite old, I'm hoping to import it to save time. I can access the code directly as I developed it years ago, so perhaps there is another way to import into Relume to save some time? Appreciate any insight. Thank you.