Retrocompatibility STB Pro 5 to STB Pro 4

Hello Everyone,
Can I open a project I work on with STB Pro 5 with a STB Pro 4 version?
Thanks!
C

No, you can open projects created using an older version of the software
using a newer version (within reason) but not the other way around.

Older versions of the program will not be able to make sense of the project
structure of the newer version of the software. Put simply, older versions
can’t make sense of the newer program’s features that they don’t have.