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Here is the correct answer from joeyqt just posted this morning:
POTENTIAL FIX (or for the developers to look into):
I looked around yesterday at issues laptop gamers have with VRAM and the integrated graphics cards (or basically CPU's doing the work instead of a dedicated graphics card).
The problem people had with those wasn't that their specs weren't good enough, it was the amount of VRAM being reported by the OS to the game at start up meaning it wouldn't load.
This is from an Intel board regarding dedicated graphics on intels HD graphics cards/drivers:
Dedicated Memory Reporting
The graphics driver now reports some amount of fictitious “dedicated” graphics memory to the operating system (128MB by default) to work around applications issues in a number of games. These games incorrectly look for some amount of “dedicated” graphics memory because they weren’t coded with the unified memory architecture for processor graphics.
The amount reported can be modified or disabled if desired by changing the following registry value:
HKEY_LOCAL_MACHINE\Software\Intel\GMM, create a REG_DWORD value named “DedicatedSegmentSize”. The value is interpreted as number of MB to report (0-512MB). A value of 0 disables reporting the dummy memory segment. If the registry key/value is not found, the driver will report the default 128MB
There are some guides online for how to set the value in the registry so that the default isn't reported to the program and that seems to have allowed me to open Dimensions, so for those on windows and having an issue fear not (performance wise I can't comment yet as I have only just managed to load it), for those on MACs this sort of thing could be what's stopping your towers from running so check for similar issues, and the development team this could be worth looking at as why there seems a certain issue regardless of hardware specs (with mine being a laptop and graphics/RAM wise I'm on the minimum requirements side of things, others should have much better performance results if this is whats holding the program back from loading).
Hope that's helped guys.
UPDATE: I've had a play around with it this morning and all's working as it should, Haven't done a render test yest but the live preview is working as it was in felix (the program is working as it was in felix in general, happy days!). "