I have placed iBooks files onlline for downloads and attached (small sized samples) in emails without problems.
I am not sure you can actually download to the iPad direct and on my websites I give the "add file" process for iTunes and also give a Dropbox link. The downloader does not need a Dropbox account to download in insert to iTunes, but having Dropbox on the iPad makes life easier, so maybe you can also add a link to the Dropbox website / app.
There is also the alternative to zip the file.
Do you handle your own websites or do others do it for you?
It is possible to download an .ibooks file directly to the iPad from a website. It's how I've managed to distribute books to colleagues when the file size was too big for email.
Given that it's about 400MB in size, I would suggest that it may take a while to initiate download, especially since going straight from website to iPad is over wireless; something like processing data in a print queue before starting to print??
Choose iBooks at 'open in' and then just leave it. Otherwise, maybe delete and reinstall iBooks, or try on a different iPad. I'd be happy to try if you want another tester.
Thanks for your help,
I actually found out the issue: when you get to "open with ibooks" with big files it takes at least 30seconds for the ibook app to start (we are on a agency wifi quite fast). If, in those 30sec, you re-hit the button (which is a possible behaviuor since nothing happens for a while) you are re-launching the command...and that means restart counting to 30secs. Of course this get worse as you click and click. I think this is an issue to be solved...or in some way explained under the open with button...
By the way... if you want to see the book, here it is!
Just wait (on the download link) for the main download (3 mins) and then click ONLY ONCE the "open with Ibook"... if you re-hit the button it will take longer. Once you press the "open with" you will have to wait around 30secs for the Ibook app (updated to the last version) to start and load the book.