yes, as you mentioned the trial version allows you to try any edition.
Software Ideas Modeler comes in two user interfaces: ribbon and classic menu - you can choose one you prefer: https://www.softwareideas.net/a/346/Ribbon-or-Classic-Menu
Reverse Engineering (RE)
In ribbon interface, you can access it from Process/Reverse Engineering - there are 4 types of RE: .NET framework, Database, Source Code and XSD. (The group contains also options for XMI and BPMN import)
In classic menu interface, it is accessible from Tools/Reverse Engineering
You can also access any feature without knowing its placement within menu or ribbon - press CTRL-Q and type the name of action you are looking for, e.g. 'Reverse' and the matching actions will be displayed in a drop down list.
I hope I helped you. In case of any other questions feel free to let me know.