Patch 1.4 is still required and is the same as with 1.4.2 onwards. 1.5 has new stuff in it, mostly bugfixes for certain meshes, a few dialog tags needed for interface changes, and template tags for some new scripting features.
Does anyone else experience unresponsive mouse problems during the Chimera plugin. The Messenger level was unplayable because of the mouse response. I tried two different mice but still the same performance.
A wise man once said that wise men were wasted on fools like me.