The link in
Squeak 4.2.5beta1U
is for the last original Mac interpreter, this can only open the old images (no closures), there is a 4.2.5b2 version in:

with I recompiled for David Lewis with the then (Sep/2014) updated VMMaker, this version can open the old images and also the Cog images.

On 21 Dec 2016, at 18:17, Bob Arning <> wrote:

Is the current interpreter VM (for the mac) one of the ones on I'm not clear how to parse the names of things into what they can or cannot do.

On 12/21/16 5:56 PM, David T. Lewis wrote:
On Wed, Dec 21, 2016 at 05:15:29PM -0500, Bob Arning wrote:
Is there a specific oldest image which current VMs are expected to run?

A current interpreter VM should run a Squeak 3.2 image, although with some
problems. It should be able to run images from the Squeak 3.6 and 3.8 era
without problems. And it should run anything else up to but not including Spur.


On 12/21/16 11:38 AM, David T. Lewis wrote:
Following up on this, the backward compatibility for interpreter VM 
old images was broken in VMMaker-dtl.387 of 8 November 2016, due to my 
to align the primitive table closer to Cog/Spur: