PicForum

Product Version: MPLAB X IDE v5.50
Java: 1.8.0_222; OpenJDK 64-Bit Server VM 25.222-b10
Runtime: OpenJDK Runtime Environment 1.8.0_222-b10
System: Windows 10 version 10.0 running on amd64; Cp1252; en_GB (mplab)

MPASM so how can i make it work with 5.5 please ?

Can't be done.
MPLABX 5.50 requires 64 bit executables. MPASM is 32 bit.

Now if MC could be encouraged to release the source code to MPASM, I'm sure a third party effort could resurrect it, but I can't see them doing that.