u must contact the guy u bought it from, oh and if there is any problems let us know as there is alot of PIRATE shops on amiga (atleast 3 in the UK atm) whom sell cdr versions of games...
anyway a small tip is, forematt sells quake 1 for 5-9 quid ...
but which hardware do u have? , you can use the clickboom version for GL QUAKE and BlitzQuake and so on if u like as you only need the ID1 dir.. , ie u wont need to type the serial code i think, been too long ago so i am not 100% sure...
worth a try anyway...