MacOS won't allow me to install DjvuLibre

I am trying to install DjvuLibre/ DjvuView which is used to ope djvu files on my MacBook. The program is downloaded as a dmg file. However, when I try to install the program by copying the program to my application folder, I get a message that MacOS can not verify that the program is free of malware. I would have to go to security and privacy settings to enable the app. However, I have to do this each time I am trying to view a djvu file. What is the solution to this problem?

Go to /Applications in Finder. Right-click Djvu application(s) and choose Open. Then it should allow it to run and remember you allowed it to run. It might open and close. Then double-click the App and it should open without the warning.

The error means this software was not submitted to Apple to be notarized. All 3rd party Mac Apps not distributed by the App Store need to be notarized with Apple by the developers. They should also be signed with an Apple Developer account.

You should only override this if you trust the App or performed your own malware analysis. Beware pirating software as malicious payloads are very common.

Apple may remove the ability to work around this problem in the future.