PROS 3 Questions

Okay, so I am pretty interested in PROS, a coding platform for V5. My first question is whether you must use PROS 3 for V5. Secondly, I wonder where you can download PROS 3 from if it is yet available.

Yes, you need to use PROS 3 to program the V5. It is not available to the public yet, only to beta testers. The API is available
PROS 3 is just a new compiler that will integrate with the PROS Editor. It is mostly the same as PROS 2, using the same editor, it just has a different API.

@theol0403 I also assume that the code will come out around the release of V5

Yes, I believe the source code for PROS 3 will be open source once it is released.