Can I specify whether I want ascending or descending date order when downloading historical data using the Excel Add-In?

By default, time-series data is downloaded in descending date order. However, you can change this by selecting ascending in the Formula Builder (accessed via the Get Data button).

By default, data in tables format is downloaded in descending date order too. However, this order cannot be changed in the Formula Builder. You would have to filter by the date column manually to change the order.