Pro version doesn’t redirect to Paypal

I had this working with the free version but because i wanted the email send after the payment I purchased the pro version. Once installed it stopped redirecting to the PayPal site and redirects me to a non-existent page on my site which contains the CF7 form ID in the name.
I disable the pro version, reloaded the free version and again it works as it suppose to. Disable the free, re-enable the pro, it fails again. I tried the few suggestions i’ve seen in this forum on this issue but nothing helps.
Has anyone been able to resolve this problem?

Thank you.