It prolly is still in queue to download. You would need to clear the queue.
Try go back to install it..there should be a button that says "clear the queue" press that..get out and do a hard reset on your phone (holding both top and home buttons)..then get back in installer and install the keyboard app again.
Or go here...
http://www.modmyi.com/forums/downloa...o=file&id=1047
download this..and follow instructions of how to upload on there...doing this manually with ibrickr, or iphonebrowser, or PCSuite.