Before you open the demo
Ten minutes here decides whether the hour is an evaluation or a browse.
The first ten minutes
Do not take the tour yet. You get one chance to see the product the way a new colleague will.
Do your own task
This is the center of the evaluation. Everything before it was preparation.
Break it on purpose
You will make every one of these mistakes in real use within a month. Make them now, while it is free.
Other people
You are the administrator of your demo. Almost nobody on your team will be.
Getting out
Before you close the tab
Reading the result
A completed sheet does not give you a score. It gives you three piles. Things you watched the software do are settled. Things on the "could not test" list are open, and each needs a different kind of evidence: a question on a sales call, a reference customer, or a proof of concept. Anything that tripped a deal-breaker ends the evaluation, which is a good result for an hour's work.
If you are comparing products, run the same sheet with the same invented records against each, and carry the piles into a scorecard. To see the sheet filled in against a real demo, read the worked example.