In May I bought the "FSDREAMTEAM - CHICAGO O'HARE INTL V2 FSX P3D FS2004" from SimMarket.
But I can't register it. "Not installed in the scenery library" which is not true.
It's possible you FSX registry keys are pointing to the wrong folder, confusing our software. You you don't say which FSX version you use, standard or Steam ? Or both ?
1 In the Addon Manager - FSDT - Ohare V2 I enter the password (FSDTORDX...) I got when I purchased it followed by "Contacting Activation Server ...
2 The License Wizard shows up telling me no license key was found and ask me to enter an activation Key, I enter the only thing I've got so far from Simmarket "FSDTORDX..."
3 "Not a valid license key" (QLM Error)
You are not supposed to see the License Wizard. That only comes if a firewall or antivirus is blocking online access to the activation server and not just the QLM (which is the newest one), but also the Esellerate one, which is up until the end of the month.
If you can connect to either of the two activation servers, both will surely activate your Esellerate key, QLM/Soraco because we have uploaded all the old Esellerate keys to it, and Esellerate because of is still up, the software will try to connect to both servers before giving up.
If no connection can be established, the License Wizard will come, and that doesn't know how to activate an Esellerate key without the server, so it will always say "invalid".
So, your options are:
1) Fix your firewall problem, so the activation will be automatic, without the License Wizard. This is of course the normal and best option
OR
2) Use the Self-help site in the FAQ:
https://qlm1.net/virtualisoftware/qlmcustomersite/insert your email, and it will email the new QLM/Soraco key which associated to your old Esellerate key. This can be activated by the License Wizard even if your firewall/antivirus is blocking the connection to the activation server.