Paul is right about this one - there are many added columns from 1.1.3 to 1.1.8, and the sole purpose of the upgrade script is to add these new columns and possibly tables to the database. If you want to fake the upgrade, you can manually edit GForum/Config/Data.pm, and search for 'version' - it should be 1.1.8; if you change it to 1.1.3, then run the install.cgi script again giving it your new 1.1.8 admin directory, it'll perform the database upgrades for you, and won't break anything.

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Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com