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in reply to Re^4: How to uninstall module of perl
in thread How to uninstall module of perl

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

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