This sort of stuff really needs a FAQ section. We are getting this type of question 20 times a day.
I can't answer your question but I'm sure that Eleni will give you some pointers later.
There are two links/pages which will help you to understand about where is your indicator and how to load it (if your OS is Windows) -
Where can I see my purchases? https://www.mql5.com/en/forum/9950/page70#comment_2564931
How to Install an Earlier Purchased Applicationhttps://www.metatrader5.com/en/terminal/help/market_buy