I'll help ensure you can open your .pdf invoice, @userpatelhgv.
When you download your invoice, you'll see the .pdf file at the bottom. Simply click the said file to open it. Please see the screenshot below for visual reference:
If you want to locate the said file, you can click the Show in folder option from the drop-down. Also, you can click the print button at the top if you wish to save a hard copy of this invoice.