Thanks for the last tip ScaleRobotics - you were spot on.

It is not enough to rename a directory from MPASM to MPASM old. You must physically remove the old MPASM version. Your tip was right, MCSP was using the now obsolete MPASM in C:\Program files\mecanique\MCSP\MPASM. I had done a default install of MBLab and that had put MPASMWIN.exe into the C:\Program Files\Microchip\MPASM SUITE directory.

I did a manual find on MPASM from within MCSP 'compile and program' options and pointed MCSP to the Microchip\MPASM Suite directory. MCSP now compiles but with a heap of errors that is o be expected for just changing the processor from PIC16F88 to PIC18G26J11 and nothing else.

It looks like a lot of homework to understand the very different config fuse structure in the 26J11 part.

I don't think my setup is quite right as I get a fleeting burst of C:\ DOS prompt when I compile but that is a task for later.

Cheers
BrianT