Yes, I was using 18.0.1.2 and installed the beta1. The config was successfully copied.
Then, I installed the beta2 and the config was lost (key mappings, colors and etc.).
I uninstalled both beta1 and beta2, and reinstalled the beta2, but the config wasn't copied from the 18.0.1. However, I didn't delete the 19.0.0 SlickEdit config directory.
Once I deleted the 19.0.0 SlickEdit config directory and reinstalled the beta2, the config was successfully copied this time. So, everything is good now.
Thanks for your help!