Reinstall InstallOptions?

i seem to have deleted my InstallOptions.dll and every thing that came with it. i still have the docs but aren't much use with out the dll.
where would i be able to download this from??? if not do i have to reinstall nsis?
thanks

Reinstall NSIS. It will ask you if you want to uninstall NSIS first, and you can select to install over.

-Stu

There are also zipped versions of NSIS for version 2.07 and above.