ZDoom

Thanks
I Will try that

This is what I suspected. The loader tries to avoid duplicates and cannot distinguish these two.
It's getting a bit tricky to sort this out.

First, make a copy of the Route 66 folder.
Then, in the copy, delete everything in it that's identical to the stock RR folder. After that you should be down to only a few files.
If you installed everything for DOS you will have to rename a few things:

turdmov.anm -> turd66.anm
turdmov.voc -> turd66.voc
rr_outro.anm -> end66.anm
rr_outro.voc -> end66.voc
game.con -> game66.con
tiles09.art -> tilesa66.art
tiles23.art -> tilesb66.art

If the destination names already exist, just delete the other one.
After that you should have it back to distribution state - now zip the whole stuff, name it route66.grp, put it in the RR folder and (hopefully) no more problems.

What we have here is a classic case of messed up Build game add-on distribution - the file system has a serious design flaw that it even prefers files from the game folder over a mod's GRP file, which led many modders to releasing their stuff in a form that circumvented this problem but required quite a bit of mess on the user's behalf. Route66 is a textbook example for that.

Graf Zahl wrote:Of course it works if you do it right. If, however you follow the install instructions for DOS, no, that cannot work.
So how did you set it up?

its been a long time so I am not sure...

but.. I ended up with a redneck rampage game folder that works in ms-dos/dosbox
and raze as the original game with these episodes:

outskirts
downtown
pissin contest

and another with route 66 that works as route 66 in ms-dos/dosbox (or in raze in a whole seperate raze installation) with these episodes:

route 66 - part 1
route 66 - part 2
pissin contest

the 66 edition of the game has the following:

route66.exe
redneck.grp (redneck.grp seem like it is identical to the one in the original game folder)
user66.con
gator66.con
defs66.con
bubba66.con

and a route66 subfolder with .map files

Of course it works if you do it right. If, however you follow the install instructions for DOS, no, that cannot work.
So how did you set it up?

I discovered that I can not have route66 and original rampage in the same raze installation

right now I have:

first dir with the original redneck game

C:\games\raze
blood
duke
duke_sw
exhumed
nam
redneck-rampage

and

second with route 66

C:\games\raze2
redneck