How to access Digital Photo Professional 4 App by Canon on my mac OS Mojavi

I have a lot of edited pictures on Digital Photo Professional 4 App by Canon which I can no longer have access to, this is the error message I get:

The last time you opened Digital Photo Professional 4, it unexpectedly quit while reopening windows. Do you want to try to reopen its windows again?

And then the quit unexpectedly and that the report will be sent to Apple! appears.

It has been over a week and I still have no way of opening DPP4?? Please help.