Please check if the payment is already cleared in your paypal account. Payments by credit card get cleared normally within a few minutes while payments by echeck take up to 5 working days to get cleared. If you login at paypal and go to the payment details, the payment state should be either "cleared" or "pending". When the status is cleared, then your subscription should be active already. If you see still ads on howtoforge and the vm downloads dont work when the payment is cleared, then logout and login again, as the subscriber state is stored in the session.
If the payment is cleared and you are not able to download a vm, then please contact us to check your account status: