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I have scanned the manuals for Lotus Improv. You interested?
As what SomeGuy had said here, you will need to upload stuff with things like Mediafire or related, as their upload servers are borked at the moment, iirc.
Improv Handbook 550 pages https://www.dropbox.com/s/6udibuiz8kb60bt/handbook.7z?dl=0
Improv in Action, 58 pageshttps://www.dropbox.com/s/0jqadke4u8kvcqw/in_action.7z?dl=0
Improv Start Here, 40 pageshttps://www.dropbox.com/s/t6cg3hp7v4jhp3y/start_here.7z?dl=0