Below is a list of youtube video tutorials and respective downloadable Excel spreadsheets.
Click on any spreadsheet link to download the respective spreadsheet for free.

Introduction

Introduction to Deriscope - Part1: Why Deriscope (video) (25:57) (sheet)

Yield Curve by QuantLib in Excel with market rates and cubic spline (video) (12:31) (sheet)

Excel Array Formulas: How to change their range (video) (2:32)

All Assets

Bond Curve Fitting in Excel using the QuantLib Nelson-Siegel and Svensson methods (video) (26:42) (sheet)

Options

Option pricing in Excel using Heston stochastic volatility from QuantLib (video) (9:59) (sheet)

Option pricing in Excel with Implied Volatility Surface using QuantLib (video) (13:08) (sheet)

Credit

Excel pricing of CDS using QuantLib ISDA method (video) (8:58) (sheet)

Live Feeds

Accessing live feeds in Excel from Yahoo Finance in 2018 (video) (5:18)

How to best use the free version of Alpha Vantage in Excel (video) (8:17)

It is still possible to get historical data from Yahoo Finance to Excel (video) (18:35) (sheet)

Historical Stock Prices and Real Time Series in Excel by Alpha Vantage (video) (9:46) (sheet)

(A)synchronous live stock prices in Excel (Alpha Vantage, Yahoo Finance) (video) (3:59) (sheet)

Real Time US stock prices in Excel from IEX (video) (4:51) (sheet)

Real Time Top Order Book on stock prices in Excel from IEX (video) (2:59) (sheet)

Real Time Data in Excel on US Stocks traded in IEX (video) (11:22) (sheet)

Real Time forex rates in Excel from TrueFX (video) (1:57) (sheet)

Real Time data in Excel with retention of the received feeds (video) (11:20) (sheet)

Real Time Trading Simulator using live stock prices from IEX (video) (11:33) (sheet)

Real Time Trading Simulator using live stock prices from IEX v2 (video) (6:15) (sheet)

Real Time Trading Simulator using live fx rates from TrueFX (video) (17:57) (sheet)