Original PDF fossils can be dug out on this page
https://owner.roku.com/DeveloperMostly of archeological interest though. Better stay with the wiki/online docs, they change - for the better - with no warning/announcements.
Pro tip for lean coders:
in TextWrangler (Mac OSX), for right-click menu "Find in Reference" to show relevant docs, in Preferences / Languages customize the VBScript entry, set "reference URL template" to either
http://sdkdocs.roku.com/dosearchsite.action?queryString=__SYMBOLNAME__ or
http://www.google.com/search?btnI&q=Roku+SDK+__SYMBOLNAME__(EnTerr's choice: the latter, since it pulls relevant results from forums and blogs too)