Yes, cpan -i MIME::Base64 will have installed the latest version from CPAN.

If you download the version of the module you want, you should be able to remove the current (newer) version and install the older version with: 

perl Makefile.PL
make
make test
make install UNINST=1

[download]

Setting UNINST=1 when you install should cause the existing version to be uninstalled.

In reply to Re^5: How to uninstall module of perl by ig
in thread How to uninstall module of perl by calvinlyp

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