I installed the trail version of Boom and, after the trial period expired, I received an email from Global Delight with a link to purchase the product. I did so and received another email with the registration code and a link to register it. I did the registration but now don't know if I need to reinstall the Boom application. If so, the only options I can find on the Global Delight website is to re-purchase the application or install the trial version again.
Comments
Regarding your query, trial version is in-fact the real app.
You just need to register the copy with the registration code provided to you on purchase. As you have already registered the app, you do not have to reinstall Boom again.
Go-to the Application folder and launch Boom.
Please make sure that you enable "Start Boom at login" (refer screenshot) within the app or via System Preference under Users & Groups.