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Hey @sshahid12
It appears that the page (Checkout page) has been deleted from your site. I can see that the Purchase button tries to go to but that page does not exist.
Can you go to the main Dashboard > Pages page and see if you still have the Checkout page created. It might have been deleted so you can also look in the Trash on that page.
Regarding the Google Pay button, it is possible that you have Google Pay enabled on the Individual downloads page. You can check by going to Downloads > Settings > Payments > Stripe and see if you have that checked. It should be a check box in the “Apple Pay/Google Pay” section on that page.