If you bought our products from MQL5.com, then your purchasing process was done through your Meta Trader terminal. Make sure at all time, you are logged in you Community Tab with your mql5.com Login and Password. They are the same Login and Password you are using to login the mql5.com website.
This is screenshot of Harmonic Pattern Plus page you have accessed from your Meta Trader 4 or Meta Trader 5 terminal.
After you have bought products from mql5.com, you will have your purchase history for your products, from here you can update and reinstall your products.
For further information about your purchased products through mql5.com, this video will be helpful for installation, reinstallation and update of your products.