You will probably need to export your private-keys into a different wallet to spend the other coins, as Armory only supports the original Bitcoin. If you don't to risk your Bitcoins while claiming the other fork coins, empty your wallet by sending your Bitcoins to a new wallet before importing your old keys into a not so reliable wallet.
Here are the methods I used to claim my coins after each fork:
To claim the BCH:- Export your private keys and import them in a supported wallet such as Electron Cash (recommended);
To claim the BTG (you will need an android device):First, confirm your BTG balance on
https://bitinfocharts.com/bitcoin%20gold/address/<YOUR-ADDRESS-HERE>
go to
https://www.bitaddress.org "Wallet Details"
put your BTC private key and press View Details (careful: make sure you are on the right site! I downloaded it from their github and ran it locally to be safe)
Install Coinomi (only available for Android)
Create a new wallet and add BTG, then choose Sweep Wallet
Swipe the QR Code "Private Key WIF 51 characters base58, starts with a '5'
DONE!!!
Always try first with a low value address, dont trust anyone when playing with private keys
Source:
https://bitcoin.stackexchange.com/a/63227