Sequel 2 or 3 No Sound in some tracks

I have a project on Sequel that I did 10+ years ago. Now when I play it on the same old computer, some instruments are not sounding at all. I am using the same computer that I used when I made the project and I have not redid anything on this computer. I hear some tracks and loops are playing, but instruments are not sounding at all. Another thing. I installed Sequel 3 on my new PC, played the same project on the new computer on Sequel 3, same issue, loops are playing but instruments are not. Anyone knows what could be the issue.