your site is d6 6.1.6 ? if not then you would need to upgrade to 6.1.6 in order to use the migration script with the latest version. Current version is 7.0.9 you might not be aware but none of your modules will work on the latest version, however you should be able to salvage your users and maybe some content.
$50-$100 is pocket change for this upgrade.
$50-$100 is pocket change for this upgrade.