Hi, how do I claim my SBTC being stored offline on a Bitcoin core qt wallet ?
Also, I never claimed BTG, SBTC, BTX, etc. So how do I get them at the same time (I mean without missing the chance of receiving the unclaimed once being sweep) ?
Claiming one coin will have no effect on the other coins.
First, send all your BTC to a new wallet to keep it safe.
Then just get your old BTC private keys (go to the console and do a wallet dump) and then import them into whatever other fork wallet you can. If it's a version of Core then you'd go to the console again and do importprivkey "PRIVATEKEYHERE" '' false
Then restart it with -rescan