Welcome to the forum, @brommys. You can ask your questions here and we will do our best to help you.
If you already have Dorico SE installed, you don’t need to remove anything: Dorico SE and Dorico Pro are the same application and which features are available depends on the license you have. Once you have the Download Access Code for Dorico Pro, enter it here, then on your computer run Steinberg Activation Manager, and you should see your Dorico Pro license appear there. Click Deactivate to deactivate your Dorico SE license, and Activate to activate your Dorico Pro license, and when you then run Dorico, it will run as Pro.
I recommend you do run Steinberg Download Assistant and choose Dorico Pro 5 on the left-hand side, then click Install All on the right-hand side to make sure you have all of the sound components installed.
You can indeed activate Dorico Pro on up to three computers for your own personal use. Simply install SDA on your new machine, sign in, download Dorico as described above, and run it to activate it.
Thanks For your answer so I don’t need to download dorico SE first? I have now a special price because I have Finale 26 so I can buy to Dorico Pro 5 crossgrade and when I have paid I hope it works. When I have paid they will send me a code in my email it’s that right?