Halion Sonic SE (am I missing something?)

Just upgraded recently (2 weeks ago)
opened some old projects to get a feel for the new layout and mixer…loving it so far…

However… I used some string presets in Hallion sonic se and while the samples are very silky… there appears to be a 30 second intermittent hiss on every sample (like a demo VST instrument)… is this merely a trial and I need to upgrade it to a paid version?

If I don’t want to upgrade, will I still be able to play the few extra patches in Hallion player?