Hi Holtt, welcome to the forum!
Apologies for how long it's taken us to reply to this, we'll be sure to reply much faster moving forward.
The demo version of SmartSVN is a 30-day trial of the Professional SmartSVN edition. The free version (once the trial has expired) reverts you to the Foundation edition of SmartSVN. There are quite a few limitations of the Foundation edition compared to the Professional edition and these can be seen in full here: http://www.smartsvn.com/comparison
So one feature you won't have on the Foundation (free) edition is the ability to commit multiple changes at once. The only advice I have then is for you to purchase a license from http://store.wandisco.com/smartsvn-professional
if you want that functionality, you'll also see from the comparison that there are a fair few other differences.
I hope this helps. If you require any further assistance in the future please don't hesitate to ask us.