You Paid but the App Still Says Free
You have paid, the money has left your account, and the app still shows the free tier. This is nearly always one specific thing, and you do not need to pay again.
The cause, nine times out of ten
Work through these in order
Find your receipt and check which email address it was sent to
In the app, check which account you are signed in as
If they differ, sign out and sign back in with the email from the receipt
If they match, sign out and back in anyway
If you bought the other product
RIP Tweaks and RIP Reticle are separate products with separate licences. A RIP Reticle licence does not unlock RIP Tweaks Premium. RIP Reticle is no longer sold, so if you paid recently, your purchase is RIP Tweaks. Your receipt shows which one it is.
If it still says free
Stop there and send us a message from the support bubble at the bottom right. Tell us the email on the order and roughly when you paid. We can see your licence from our side and put it right.
Please do not buy it a second time
How long it should take
Access is normally there immediately after checkout. If it is not there within a few minutes, something needs looking at rather than waiting out.
Related: Cannot log in, Cancelling and refunds.