once I installed my licensed product it is being locked. so how can I get back my license?
What exactly do you mean by a locked license? I don’t know this term. Could you attach a screenshot from Steinberg Activation Manager, please?
This message has come to me when I tried to launch the program.
“No valid license has found. The program will quit now.”
What does it look like in the Steinberg Activation Manager, please?
If You could see it this is the image of the command.
As @Martin.Jirsak said, please open the Steinberg Activation Manager application on your computer and post a screenshot. You can crop out or obscure the “Signed in:” e-mail address, but please leave the rest of the screenshot intact.