Instead of MPASM, use the (free mode) which includes a built-in assembler:
📍 : To get MPASM v5.51 safely, download the MPLAB IDE v8.92 installer directly from Microchip's official archive. mpasmwin.exe v5.51 download
: This is the most common source for MPASM v5.51. It is available in the Microchip Archives . Instead of MPASM, use the (free mode) which