Currently for Fedora Workstation and Server the current release is 37. For experimental purposes to learn how to do an upgrade for example from 36 to 37 I need the .iso for 36 - it through VirtualBox, but in the following links is not available
Fedora Media Writer:
If you need a pen-drive you can use the Fedora Media Writer mediawriterdirectly and download from it up to 3 different versions. For the moment you can get F35/36/37