Yeah you're probably right; but I can provide at least two problems' solution!
Windows 10, Battlefront II not Steam edition, and I get a Goldberg error (missing steam_api(64).dll) and the second instance crashing after some seconds.

For the Goldberg issue, I simply downloaded the library (easy to find on the internet) and pasted in the BattelfrontII/GameData folder. Note that you should rename the library, adding the parenthesis, in case the library has another name (e.g. mine had steam_api64.dll instead of steam_api(64).dll).

For the second issue, problem is Nucleus' script only works for Steam version; so I simply put the Spy executable, and it ran! 

Hi all, new topic because I want to speak about other way to play splitscreen on pc than the one proposed here.
This post on Reddit says it is possible to make it via NucleusCoop.
I think it could be a good idea to have a place here on swbfgamers.com to speak about it, mainly for problems showing up.

Ok, first problem on the topic's list 
On Windows10, I'm getting a steam_api(64).dll error running the game with Nucleus, but the game starts anyway... only to crash when the second instance opens. Working on it, I'll give updates.

I noticed this on PS2, in Assault mode in Mos Eisley: when you strike an enemy force user so that he falls to the ground, sometimes he suddenly jumps away, without the getting up animation (that I have to wait for when I fall to the ground  )
Is this a bug, or is there a way to do so, some commands combination or what?
Thanks in advance for replies

Battlefront II is the best game I've ever played 
Wonderful there is a dedicated site  Found it searching a way to play BFII splitscreen on a pc