How to Flash newest TWRP Recovery?

Hello guys i am trying to flash a dirty unicorns rom but it says that i need to verify my phone is running the latest TWRP recovery. I am currently on the 2.8.5 version and i know that the 3.0 version is the newest one. I believe i read in a thread not to use FLASHIFY? Also do I HAVE TO update the recovery or am i ok with using the one i have? Thanks

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