Actually, assembly is not the only "language" without locals, basic had no locals for ages and programmers didn't miss them (it's actually easier to have local variables in most machine-code then in basic).

However, in Perl, you should use my variables. You just put the whole script in

RUN: {{
....
}}
[download]

and declare evry variable as my inside the braces, and just redo RUN when needed.