welcome to the Death Spiral of legacy software
I would go back to an earlier version of mplabx , [3.55 works ok]
get pbp working again . and then try 4.1 again , don't remove 3.55 though.
usually mplabx allows multiple versions to coexist , I have not tried 4.1
ps
PBP_MPASM_Connector.exe you did try this ?
its in you pbp/ MPASM-MPLAB_SETUP folder
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