eval "use $module";
$@ and die $@; # or warn $@, etc.  die seems appropriate here
my $vendor = $module->new();
# ...
[download]

eval is necessary because use is normally a compile-time directive. You could get a similar effect with require and import; for your purposes, use is probably easier.

$@ is where eval puts its error messages. See perlvar for more details.

hdp.