Google/Bing free octave vst and you will find a number of them that will take a guitar down at least an octave. Note that I have no experience with any of these.

Another option is to record the guitar simulating a bass part then drop that part an octave.


Life is short so make sure you spend as much time as possible on the Internet arguing with strangers.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware