The PDF version of Users' guide has been updated to version 6.30 and is available for download from usual place http://www.amibroker.com/download.html
I'm using 6.20 and a User's Guide for 6.00. Is there a User's Guide for 6.20? Thanks.
The users guide matching the version installed is on your hard disk already.
Just PRESS F1 key in AmiBroker. It will bring up user guide matching your version.
As for PDF, it is for version 6.30 only http://www.amibroker.com/download.html
Also online version http://www.amibroker.com/guide/ is current (6.30).