Help me find the mod (Serious Sam: The First Encounter)

Hello everyone!. In short, somewhere on YouTube I watched for a long time a review of the entire series of Cool Sam, and so, there was shown a mod that in the First and Second preceding makes a side view as in Cool Sam Double D.

I tried to find the mod on different sites, I searched in Google and on YouTube but did not find it. As a result, I decided to contact the forum here. Suddenly someone has seen the mod and knows where to look for it. And if you still know where you can download this mod, then I beg you, give a link to the mod.