Readability (which often is eq 'maintainability.'

• Be generous with whitespace; Perl doesn't charge by the " " ( nor by the \t )
• Indentation -- find a style YOU like and use it... for example:
  

  if ( !-e $xmlpath ) { 
      if ( !-e $outpath ) {
          $data=
      }
  }
  [download]

• Global declaration of all vars (see Re: code for review ) above... and, style-wise,
  my ($aff_print, $aff_print1, $outpath,  $data ....);
• else {}}else {} Huhn?

Update: And, if -- as it appears from the comments above -- you have edited your post without notice, DON'T.

Use strikeouts rather than removing or editing text or code; mark additions and insertions for what they are. Editing without acknowledgement destroys original context and can make posts by others appear senseless or inexplicable.