I have purchased PRE9/PSE9 but before I install everything I wonder if I need first to finish my PRE8 projects from my PRE8 installation or if I can remove PRE8 completely (which I prefer because I never got the cache file handling resetted to work properly, see PrE 8 scratch disc won't go back to SAME AS PROJECT). I know from previous PRE versions that if the step is too large the project files of an older version may not be loadable/work, but since PRE9 and PRE8 seem rather close it may work.
Is there anybody with some experience on this issue?
I always recommend against opening an older version project in a newer version of the program in my books, Bernard. It almost always leads to buggy behavior.
I recommend you finish your version 8 project in version 8 before moving on to version 9.