Here:
scirra.com/manual/87/8-direction
On the left side it says "Download the Official Construct 2 Manual (2.2mb)".
It will try to link to "https://www.scirra.com/manual/87/manual.zip"
which will bring you...back to the page you click it from...
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Found it:
"https://www.scirra.com/manual.zip"