pacaur/cower not finding libalpm.so

I’ve upgraded Pacman to 4.2 then I can’t upgrade the packages which I have been installed from AUR. The Terminal tell me that:

cower: error while loading shared libraries: libalpm.so.8: cannot open shared object file: No such file or directory

Is the problem is missing libalpm.so.8?
I’m trying to locate it with the command:

$ locate libalpm.so.8
/usr/lib/libalpm.so.8
/usr/lib/libalpm.so.8.0.2

It’s existed, then we need rebuilt cower to help it detect libalpm.so.8. But I can’t install any packages from AUR, the way to done is manual download PKGBUILD then makepkg.

Someones has the error: ERROR: One or more PGP signatures could not be verified!. To solve it, add the missing PGP signatures into your Pacman Keyring:

$ gpg --keyserver pgp.mit.edu --recv-keys F56C0C53

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