in reply to 32bit DBM files and a 64 bit perl.

AFAIK, the file format did not change.   But you can’t mix apples and oranges.   You need to get and to install, or build, 64-bit versions of these modules ... or install a 32-bit Perl interpreter, which by the way you can do alongside what you already have without utterly replacing it.   (It will need its own 32-bit CPAN library etc.)