I'm currently on SW19 and I'm getting ready to update on 2020. I'm new to Solidworks and I'd like to know if there are things to do or not to do to avoid having errors following the software upgrade (file compatibility problem etc). Knowing that I am the only cartoonist in the company so no problem of compatibility with other positions.
If you can, it is recommended that you uninstall version n-1 before installing version N.
Make a complete download that you will save on a stick or an external drive (allow between 15 and 20GB). Do this download now to be sure to have it when you decide to do your migration, depending on your connection, it takes a little time.
WARNING, if you want to keep the 2 versions, don't forget that a file saved by an N version is no longer editable by the N-1 version. So you'll need to separate the template files and other libraries.
As it's your first time, plan a short half-day (I'm very large if it goes well), without having a file to hand in the next day...