Go ahead and download it with CPAN using force install. Also, see: Re: Is it possible to use IPC COW with Perl?.

In reply to Re: Error installing Storable: t/restrict fails with 'COWs do not become read-only' by Khen1950fx
in thread Error installing Storable: t/restrict fails with 'COWs do not become read-only' by boxofrox

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