Errors running Grunt and Sass

Question

I've been trying to get Sass up and running with Bootstrap. I've followed the tutorial, going so far as to install exact versions of the dependencies listed rather than the default/latest versions. I've done this from scratch at least three times. I've uninstalled and reinstalled different versions of Sass and Compass (mainly according to Sass --compass --watch Error: Cannot load compass), as well as older versions of Ruby (I just installed 2.3.3, down from the latest release).

But whenever I get to running the grunt sass command, something goes wrong. I've gotten errors about not being able to load Compass. If I search and rectify that, I'll go through an error or two more (not on hand sorry, I've closed everything out), but keep ending up on:

C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/compass-core-1.1.0.alpha.3/lib/compass/core/caniuse.rb:72: warning: circular argument reference - browsers
NoMethodError:  
  Use --trace for backtrace.
Warning: Exited with error code 1 Use --force to continue.

I've looked up this error, and I've tried doing the bundle update listed here, but end up right back where I started with the same problems (since now there are updated versions of dependencies that apparently don't play well together, and compass things don't work again).

I know how to use Sass, I just can't practice since I can't get it running. I'm newer to coding, and I don't know Ruby at all, so I'm stuck now that my search-fu has failed me. My machine is running Windows 10. I am specifically looking to set up Sass to run with Bootstrap 4 (yes, I know it's in alpha, it's what I'm required to use for work) and there doesn't seem to be any good documentation out there about how to actually get it running properly.