Can't start the game, as it's telling me need to enter product key

For those wondering if this thread is dead or false.. let me confirm to you, that this does resolve my issue. However, every file that ended with .DLF I removed. I believe the issue was when you update the client, after not playing that title for awhile, it fails up open/update the current DLF for that game.

I can't confirm this will work for everyone.... sadly I wish I knew about this many years back when my CnC collection was having a similar issue..

good luck guys! Let's try not to keep making dead threads