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download autosplitter program "AutoSplit_1.5.0.zip " found here and extract files (exe, ico, and pkl) to a new folder. There is more information about the program itself if you're interested in reading up on it.
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download split comparison images found here and put this in the same folder as the autosplitter program you downloaded from step 1.
Folder should look like this at this point : 
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in whatever program you use with your capture card (I use OBS, personally), either project that capture or figure out the coordinates of the capture region (position and size) I use fullscreen or windowed projector (right click capture card source and near the bottom)
but you could also just right click the capture card source and go to 'transform' -> 'edit transform' 
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open AutoSplit program and do these things :
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make sure your livesplit hotkeys match the autosplitter hotkeys
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choose the Split Image Comparison folder by clicking 'browse' then selecting the folder downloaded from step 2
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click 'custom thresholds' and then change the value for 'pause time after split' to 1.0
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click 'select window' and then depending on how you set up your capture card from step 3, click in the windowed/fullscreen projection or input your X/Y/Width/Height from your 'edit transform' OBS screen to match and you should then see your game feed in the left 'capture region' box in the autosplitter
(note, you may have to adjust X/Y/Width/Height to make sure all gameplay is being captured properly for the autosplitter to compare against correctly) -
go to 'file' -> 'save settings as' and save these settings to the same folder where everything is stored at. This way, when you open the autosplitter in the future, you can go to 'file' -> 'load settings' and bring in everything so you don't have to click through all of the boxes and manually set it up every time
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open livesplit (double check your livesplit global hotkeys match the autosplitter global hotkeys) and then start livesplit before heading into the first level of the run. The timer will start but should pause at about a second or two until the first level loads
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keep the autosplitter program and livesplit active, I don't think the program works well or at all if it's minimized or it's not actively engaged but you can always mess around to see what you can and can't do
That should be about it, I think. Hopefully if the capture region is set up properly, the split images will work in conjunction with livesplit to pause and unpause your timer throughout the run.
A test run :
