I deleted my old wallet before I transferred my coins over to my new 2.0 wallet. How can I reinstall my old wallet?
You only need to import your .keystore file or private key to new wallet
You can import your keystore or private key through web wallet or light wallet. then you can get a new address with the beginning of NULS and see your balance.
for light wallet:https://github.com/nuls-io/nuls-v2/releases
web wallet: wallet.nuls.io