The update from August 9 fixed the bug where Emma could get infected on the zipline without a scene of her being bitten. This means that it's impossible to use the fastest Rough Night route (as of now) on the current patch. This only impacts Rough Night runs, and a current patch run can easily beat the unpatched WR with the new timesave. However, the old patch route saves 7.7 seconds over the current patch route. I don't think that downpatching is possible for the PC version due to DRM, but it might be possible on console with a disc version. I don't know much about downpatching games on PC though so I could be wrong.

I've also heard that some updates to the game added new scenes and removed other scenes. I don't know what these scenes are and I can't check to see what has been added, but I think they mainly involve finding collectibles. I don't think they have a large impact on the game or runs but I felt it important to mention.

i wouldnt recommend using the 1.00 version of the game for speedruns. Mostly because of 2 extra scenes. the first extra scene is like a 10-20 second timeloss, it happens after Laura turns off the switch in chapter 9 and she runs past Travis and he starts speaking which normally in 1.05 isnt there.

the next timeloss is about 1-2 minutes in chapter 9: (i made a video comparing the 2 versions)

This is the main reason why not to use version 1.00 (there are some timesaves in 1.00, but i doubt its overall faster) so the 7.7 timesave for (Rough Night) isnt possible for console atleast, not sure how pc works.

(the dylan part has nothing to do with different versions, but its a faster route ive found)

That's really interesting about the scene before Chris attacks. Thanks for the info!