Login to your CEX.IO account.
Navigate to the transaction history page.
Update the filter to All currencies, All transaction types, and choose a date range that includes All of your trades.
Click the Download CSV button on the bottom left of the page.
You will receive a file in .csv format. Navigate to Step 1. Import. Select Add Account then choose the CEX.IO tab on CoinLedger. Click on Upload File and drag your CSV file into the box to import your transactions.