I've never been able to claim CLAMS from old BTC addresses, is there a specific way to do it?
Synced the whole blockchain then pointed to a local BTC wallet.dat file but no luck (with the Windows and Mac Desktop Wallet).
Is there another way to claim CLAMS from old BTC addresses? Any guide anywhere?
Or is this now over and cannot claim anymore?
It sounds like you did it correctly. The distribution is indeed still going on. You should have some sort of debug.log output that it was scanned. You can also run 'importprivkey ' to test a single key(BTC/LTC/DOGE).