Apple makes it really hard to support older versions of MacOS. Even though 
10.10 has only been available for a little over three years, some of the 
underlying libraries that we rely on no longer work with 10.9 and earlier.

Subsurface 4.6.4 worked on older versions of MacOS (10.8 & 10.9), but the 4.7 
series all require 10.10 or newer.

/D

> On Jan 7, 2018, at 1:44 PM, Charles Hochhauser <[email protected]> wrote:
> 
> Hi All:
> 
> I am new to Subsurface.  I recently downloaded version 4.7.6 and tried to run 
> Subsurface for the very first time.  I have a Macbook Pro with OS X 10.9.5. 
> My understanding is that Subsurface should run on MAC OS 10.9 and newer.
> 
> When I start Subsurface a popup with the following message appears:
> Subsurface cannot be opened because of a problem.  
> 
> Check with the developer to make sure Subsurface works with this version of 
> OS X. You may need to reinstall the application. Be sure to install any 
> available updates for the application and OS X.
> 
> Click Report to see more detailed information and send a report to Apple.
> 
> OS X is patched up to date.  Please tell me what I am doing wrong or how to 
> correct/get around this error.
> 
> Thank you,
> 
> Charles
> 
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