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If you're getting the message that says "macOS cannot verify that this app is free from malware," you just need to click through some extra steps to fix it. Click on the question mark in the  bottom left corner, which should open up a   panel that says "Protect your Mac from malware." Then click "Open the  General pane for me" which is in blue text under the first item in the numbered list.  Press cancel on the screen that has the "cannot verify that this app is free from malware." Then,  a message should pop up on the General pane , where you can select "open anyway."   Basically,   macOS is really suspicious of your software and you just have to jump through a bunch of hoops to open it anyway.