There is an OTA download for Documents To Go free version for the 9630. I found the link by searching this forum, and then it took more digging around on the Dataviz site to find the exact instructions and link. Start checking here.
http://www.dataviz.com/downloads/redownloads/index.html
If I find the exact link again I'll post it. But I was able to redownload it OTA.
Edit... checking the history on my BB browser...
http://www.dataviz.com/handheld start there