How can I link a specific PDF document to link on the Thank you page?

I have 2 PDF templates , based on an option selected in the submission the user should receive one or the other.  Currently yer PDF_Link only downloads/displays the first PDF I created but I'd like to use a condition to make a second Thank You Page that downloads the other PDF

You may setup conditions to display the Thank you page based on the fields selected on the form by following the guide below:

https://www.jotform.com/help/317-Change-Thank-You-Page-URL-Based-on-a-Condition

You may use the following URL format to provide the link to the specific PDF report.

https://www.jotform.com/pdf-editor/view/{form_id}/{report_ID}/{id}

For example, if you want to link to the Check In report, you may use the link below in the Thank you message.

https://www.jotform.com/pdf-editor/view/200226467944154/10202117555495053/{id}

You may find the specific report ID from the PDF editor by clicking on the report title. Please see the screencast below:

Hope this information helps!