Question / Help HD60 S+ and 2013 Macbook Pro i7 (Mojave)

Hello all,
I have been unsuccessful in attempting to Livestream with my Panasonic GH5 on a 2012 13 inch MacBook Pro, 16GB RAM i5 using the Elgato HD60 S+ smoothly, regarding OBS' streaming bitrate... that MacBook has MacOS Sierra. I attempted to stream with another MacBook Pro, which is a 2013 15" i7 with 16GB RAM... but it runs MacOS Mojave. Anyone know why this is? On Elgato's website it states the Mac system requirements to be Sierra or later.
 
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