@sleve_mcdichael actually neverminded, that worked! I did a fresh install of RetroPie on another SD card and added the commit code version number 110020000 to the ppsspp.sh file after master. Then I Installed from source and it installed the right version (v1.10.2). Games that were broken are working again. Really appreciate the help!
EDIT - For others trying to do this, do the following to install PPSSPP v1.10.2:
Make sure the PPSSPP emulator package is not installed (remove it if it is)
Open file /home/pi/RetroPie-Setup/scriptmodules/emulators/ppsspp.sh with the editor of your choice
Edit the line :
rp_module_repo="git https://github.com/hrydgard/ppsspp.git master"
to be :
rp_module_repo="git https://github.com/hrydgard/ppsspp.git master 110020000"
Save your changes to the file
Install PPSSPP emulator package from source