Here you said:

I need to use Perl 5.12.4

Why? That version of Perl is now 12 years old, meaning 12 years of security and performance enhancements you're missing.

Anyway, IO::Uncompress::Unzip is a core module; see its documentation for examples. If you have trouble with it, please post a Short, Self-Contained, Correct Example that reproduces the problem.