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 (25:57) ExcelDerivatives-Part1.xlsx

Yield Curve by QuantLib in Excel with market rates and cubic spline (12:31) YieldCurve.xlsx

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

All Assets

Bond Curve Fitting in Excel using the QuantLib Nelson-Siegel and Svensson methods (26:42) YieldCurveNelsonSiegelSvensson.xlsx

Options

Option pricing in Excel using Heston stochastic volatility from QuantLib (9:59) FxOptionAnalHeston.xlsx

Option pricing in Excel with Implied Volatility Surface using QuantLib (13:08) OptionPricingVolSurface.xlsx

Credit

Excel pricing of CDS using QuantLib ISDA method (8:58) CdsPriceIsda.xlsx

Live Feeds

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

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

It is still possible to get historical data from Yahoo Finance to Excel (18:35) YahooHistorical.xlsx

Historical Stock Prices and Real Time Series in Excel by Alpha Vantage (9:46) AlphaVantage.xlsx

(A)synchronous live stock prices in Excel (Alpha Vantage, Yahoo Finance) (3:59) ExcelLiveFeeds.xlsx

Real Time US stock prices in Excel from IEX (4:51) ExcelRealTimeIEX.xlsx

Real Time Top Order Book on stock prices in Excel from IEX (2:59) ExcelRealTimeTopOrdersIEX.xlsx

Real Time Data in Excel on US Stocks traded in IEX (11:22) IEXAllData.xlsx

Real Time forex rates in Excel from TrueFX (1:57) ExcelRealTimeTrueFX.xlsx

Real Time data in Excel with retention of the received feeds (11:20) ExcelRealTimeAdvanced.xlsx

Real Time Trading Simulator using live stock prices from IEX (11:33) DsTradingSimulator.xlsm

Real Time Trading Simulator using live stock prices from IEX v2 (6:15) DsTradingSimulator.xlsm

Real Time Trading Simulator using live fx rates from TrueFX (17:57) DsTradingSimulatorFX.xlsm