How to Use the Free Demo

Step 1. Go to MetaTrader Market product page.

• Via the terminal
Enter 'volumebyprice.com' in the search box on the top-right corner of the toolbar.
Guide Image 1: How to Use Set Files or

• Via web browser
MetaTrader 4: https://www.mql5.com/en/market/product/35577 
MetaTrader 5: https://www.mql5.com/en/market/product/35579 

Step 2. Sign in to your MQL5.com account (if you do not have an account, sign up here ). Click the 'Download demo' button.
Guide Image 2: How to Use Set Files

Step 3. Open the 'Strategy Tester' window:
menubar  view  strategy tester
Select the 'Volume by Price MT4' or 'Volume by Price MT5' indicator.
Optionally adjust default configuration via the 'Inputs' tab. Click the 'Start' button.
Guide Image 3: How to Use Set Files

References
"Testing Visualization - MetaTrader 5 Help" https://www.metatrader5.com/en/terminal/help/algotrading/visualization 
"Setup - Tester - MetaTrader 4 Help" https://www.metatrader4.com/en/trading-platform/help/overview/strategy_tester/strategy_tester_setup 