Demo Rescue PST Software - Time Limit?

I downloaded SysTools Outlook Recovery Demo software about a month ago. I have accessed it countless times. I know it limits how many emails you can export without paying for the full-blown version. However, now it opens the selected file, but loads few to no emails. What’s up with that? Could there be a time window in which to use the demo OR a limited number of times to access the file? What do the SDopers know about this? Any direct experience with this specific demo s/w?