Here's the promised downgrade to the A5.2 engine - the last engine that supported software rendering and ran on very old machines without 3D hardware. You need a valid A6/A7 Commercial or Pro password for downloading the downgrade:
A5 setup A5 Commercial key A5 Pro key The key is required for installing the setup or an A5 update.
Note that A6 levels or models won't run with the A5 engine. You'll need to use the A5 WED and MED editors for creating A5 objects.
The updates to 5.24 can be found at
updcom524.exe and
updpro524.exe .