To be fair about OcDS although its still in beta it does still work. I have not noticed any glitches though admitting I have not been doing anything adventurous.
To my mind Iray has made Octane and OcDS redundant.
The performance and characteristics of the 2 programs is very similar but Iray already ...

Sorry folks but as luck would have it I found the button on top of the open viewport which says "Switch Render Size to Viewport size/Render setup.". Its just to the left of the question mark button. So answered my own question.

This should be obvious but in Octane 2.1 unlike Octane 1.2 I can not force Octane to render in the size I want. The slider bars don't affect the picture size only the size of the picture on the screen itself. I want a render way bigger than my actual screen size. Why cant I render at 4096 x 2400 say?

I loaded up OcDS 2.1 PRE RELEASE 4th and it says "This pluggin account XXXXX is not valid for version 2.x."
I have already bought Octane 2 and when I did it said "Users with v1.x licenses can now upgrade the license to access to OctaneRender™ Standalone Edition v2.0. The upgrade is EUR99. For a ...

Currently using Octane 1.2 with Daz Plugin 1.2 and everything works fine.
I assume there is no point updating to Octane 2.0 until Daz Plugin 2.0 available.
Does Octane 2.0 with Daz Plugin 1.2 or 1.5 actually work?

Thanks it works. I did only have the small version of the file as you guessed.

I have Windows 8.1 64 bit and I did your instructions at top and reloaded everything. Octane standalone works and is activated. The pluggin activation manager says 'activated' but it never does anything and everytime I open Daz Studio I have to activate again. (Just as midnight stories reported ...