First of all, there is a difference in key(file) and product key (numbers and letters?). The product key is about 30 letters/numbers long. The key is a file which is used to install a number of MC's on different machines, or after fresh installs etc. I'll call the file "key" and the product key as a "product key".
There is several ways you can and have to activate the full version. this is a short description.
- First time you download and install MC15, trial version.
- You choose to upgrade to full version (pay for a product key)
- You'll get a product key as well as the key file, which you can use for a number of 30 14 days before it's expired
- You'll have to save this file if you want to install and restore multiple copies. The restore functionality from internet is limited to 10? restores
- If you still have this file, and it's not expired, you can double click it and your trial version of MC will be upgraded
- If you don't have this file, you'll have to choose restore when starting MC15. Choose the restore from internet (or what ever)
- Enter your product key and you'll get the file again, for future installs (30? days). The key should be used to unlock MC15 automagically
- If you're not sure about the license number, then you can get this by mail (together with the key file I think)
This is just taken of the top of my bad memory, but it should not be very much off.