There’s no malware despite what the dialog says! It’s just a newer application they haven’t validated yet. We’ll work on validating it (signing it), but to get started, see below.
Right click → Open
To run applications that get that message, you can right click and choose open (ones you trust, naturally).
Second dialog with the Open button
If you choose open, it will remember your choice and running the application normally would act as expected.
Thanks for the patience!