If you want all the goodies a modern IDE provides, as Richard noted, forget ancient basic laguage. Go for a new C compiler that supports all new and wonderfull PIC that i wish could use right now. Such as the 18F06Q41.

But PBP3.1 can work with MPLABX 5.35, not beyond that version.

There are other compilers, for example Swordfish that supports only 18F series, but is updating regularly the PIC that it supports. Also Proton Compiler is also a nice solution as it gets support by a large group of users and supports even dsp and 24 series.

I am very sorry to say that PBP is dead and we have to accept that. It won't evolve any more. It was a great compiler and could be the greater of all but people are getting old, retired or leaving this vain world...

Ioannis