Thanks for the help guys.

I have sussed out the two issues that I had.

For the INTS-14 version on the 16F877 that wouldnt compile, the problem was highlighted in DT_INTS-14 itself. I should have read through the comments rather than just blindly following the examples on the web. I missed this very important bit of information......

Code:
;-- Place a copy of these variables in your Main program -------------------
;--   The compiler will tell you which lines to un-comment                --
;--   Do Not un-comment these lines                                       --
;---------------------------------------------------------------------------
;wsave   VAR BYTE    $20     SYSTEM      ' location for W if in bank0
wsave   VAR BYTE    $70     SYSTEM      ' alternate save location for W 
                                         ' if using $70, comment wsave1-3

' --- IF any of these three lines cause an error ?? ------------------------
'       Comment them out to fix the problem ----
' -- Which variables are needed, depends on the Chip you are using -- 
;wsave1  VAR BYTE    $A0     SYSTEM      ' location for W if in bank1
;wsave2  VAR BYTE    $120    SYSTEM      ' location for W if in bank2
;wsave3  VAR BYTE    $1A0    SYSTEM      ' location for W if in bank3
' --------------------------------------------------------------------------
The problem with the DT_INTS-18 version was also self inflicted. When I first tried to use them I got a compiler error saying that INTHAND wasnt defined.

I looked at the include file and saw the following.....

Code:
DEFINE  INTHAND       INT_ENTRY_H  ' Context saving for High Priority Ints
DEFINE  INTLHAND      INT_ENTRY_L  ' Context saving for Low Priority Ints
I saw that one was for low priority and one for high priority and assumed the first one should be INTHHAND so I edited the file. I didnt get the error anymore but it also crashed the whole program !!!

Anyway, putting that behind me, thanks to you guys for pointing me in the right direction. If I ever stop looking at these pretty toggling LEDs I will be attempting amazing feats with interrupts to make my programs run faster and smoother.