I’m planning to reformat my machine. The downloads section has only versions from 2019.
I edited your post. Generally, it’s a good idea not to share things like personal contact info or your serial number on public forums.
I checked, and you do have an unused 2019 license. If there isn’t a technical reason to continue using 2018, you could install 2019 instead.
I made the license manager send you the 2019 license. Look for an email that just came in.