Yeah I can't help troubleshoot changes to the orders.php files that are as a result of other add-ons you installed.. The error you have indicates that some other add-on has modified a section of the orders.php file that is NOT modified by Ty Package Tracker.. When you re-install make sure you use WinMerge or Beyond Compare to carefully check any of your core file changes..
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I don't answer support questions via PM. Post add-on support questions in the support thread. The question & the answer will benefit others with similar issues.