Not need to uninstall PD9.
Once installed PD13, checks PD9 still works.
Here I had PD12 and PD13 on the same PC for a while without problems.
However PD10 stopped working, so I have doubts as to PD9.
AMD-FX 8350 / 8GB DDR3
SSD SUV400S37240G / 2-HD WD 1TB
AMD Radeon R9 270 / AOC M2470SWD
Windows 7-64 / PD16 Ultimate