the problem is likely caused by your antivirus, that has mistakenly confused the Addon Manager as a threat, and it has blocked it, or corrupted, or blocked its download.
- With all the sceneries installed, download the Stand-Alone Addon Manager for FS9 (link is on the Cloud9 page)
- During installation, you need to TURN THE ANTIVIRUS OFF. Not just quit from its interface: you need to stop realtime protection. Yes, this is important.
- After the installation, BEFORE launching FS9, you need to instruct your antivirus to exclude this file from scanning:
YourFS9Folder\MODULES\bglman.dll
Or, the whole MODULES folder.
- After having configured the antivirus this way, you can finally turn it on, and launch FS9