CDGS2018 interaction with CDGS2019


I have both CDGS2018 and CDGS 2019 installed on the same computer. When I am on  Coreldraw2018, and I try to edit a bitmap image it now opens Corel Photopaint 2019 instead of the 2018 version of photopaint like it used to. How or what can I do to change this so that when I am in Coreldraw2018, editing a bitmap image opens Photopaint 2018 not Photopiaint 2019? Would appreciate thoughts, tips, suggestions...

I am not ready to move up to CDGS2019 yet and give up my CDGS2018 altogether.