For a detailed description of swap.nextdao v1.0 bug, please refer to "Swap.nextDAO v1.1 Upgrade and User Migration Guide".
Last update date of this document: January 30, 2021
Download web-wallet (v0.94) here.
Click Source code(zip) to download the compressed package to any local directory.
After download, decompress the zipped file and drag/open the index.html file in a fresh web browser tab (alternatively, you can double-click to open the index.html file).
Once open, you will see the following interface in your web browser.
The options in the upper right corner can switch the network (Mainnet, Testnet) and language. You can choose your own native language. The network selected must be the Mainnet.
Within NAS nano Pro, click the "My" tab followed by the "Wallet" tab and select the wallet you are staking/providing liquidity for (if using multiple wallets, the process must be completed for each one), click the "Settings" icon (looks like a hexagon) in the upper right corner, select "keystore."
Follow the on-screen instructions to save the keystore file and save it as a .json file on your local computer. Be sure to follow the safety instructions.