The graph view and dopesheet view are only available in animate mode, not in setup mode. You need to switch modes first!
To switch to animate mode:
Click the icon in the upper left corner of the viewport (the main area where you see your skeleton). This toggles between setup mode and animate mode.
Once you're in animate mode, you should see the graph view at the bottom by default, with the dopesheet view available as a tab next to it. If they're not visible, you can open them from the Views menu in the upper right - but make sure you're in animate mode first, as these views specifically are only available in that mode.
Quick tip: You can also press F9 to toggle view visibility if you've accidentally minimized them.
The trial version does indeed have all the features of Spine Professional, so you should have full access to the animation tools. The only limitation is that you cannot save or export your work.
