I have two questions. Is PG2 modable and where can I find a good tutorial on the instalation of the mod. Thanks.

This is a little bit out of date but gives a pretty comprehensive overview of the process :

[url=ftp://ftp.wargamer.com/pub/pg2campaigns/clearinghouse/misc/dummies.zip]ftp://ftp.wargamer.com/pub/pg2campaigns/clearinghouse/misc/dummies.zip[/url]

This website has a large number of campaigns, maps, links and so on :

http://hosted.wargamer.com/pg2campaigns/steve/pg2.htm

Thanks for your answer but, can you mod the down_ load from gog the same as the original disk. Thanks again.

Sorry, can't answer with certainty. The GOG download does include the executable that most new campaigns use (PGUK220.exe), however.