Today I had the same problem.
I managed to install 6.44 by running the following from cpan cli (you can access it by simply typing cpan in your terminal).
The developer for Date :: Manip has archived previous versions of the module, you need to add the backpan url to your cpan configuration so you can look for it.
o conf urllist push http:
Now you can install using the direct path to version 6.44
install SBECK/Date-Manip-6.44.tar.gz
I had to admit that the checksum was not present in the package, but after that the module seemed to install correctly.
I suspect that you will want to monitor the module and this error report so that you can update after fixing it.
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