I have successfully installed Gimp on Mac mini and Macbook Pro running Yosemite 
( haven't
upgraded for various reasons). In Preferences there is a panel called Security 
and Privacy.
I am assuming it is virtually the same on your system. It has a section titled
"Allow apps downloaded from" with several options represented by radio buttons.
I have mine set to "Mac app store and identified developers"

Since the Gimp developers don't fall into this category, the system will not 
allow it to install.
HOWEVER. When the dialog telling me that it is from unidentified developers 
comes up
during the install process, it has an option for making an exception for the 
current app.

I used this to let the system continue installing it. It also requires an admin 
user and password.
Perhaps you missed this step, or it may not be available to you. If it isn't 
then someone else
will have to offer advice/info.

As a conjecture, based on Apple's current business model, opened source apps 
may be being
pushed out the way in favor of proprietary and favored programs and authors, 
with the cover
story being security concerns.

Jeff K
> On Nov 21, 2017, at 2:35 PM, Nat Johnson <[email protected]> wrote:
> 
> Am using High Sierra, but Mac will not verify download no matter what I do.
> 
> Tried versions #18 & #22
> 
> Any thoughts?
> 
> 
> 
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