What do you mean a corrupted one? If you're trying to open the JAR file, that won't work since you need to put it in the scripts folder.
Try deleting your OSBot folder in Users and run the client again.
E: Didn't see the comment above, the folder in there, the "scipts" folder, that's where you put the downloaded JAR files in. Then load up OSBot, start up a tab, run then go to the "Local Scripts" tab and refresh. The script should be in there.