Read the following information about where to find it (if your OS is Windows so you will find it; but the market does not work if your OS is Linux or MacOS)
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
Please enable the necessary setting in your browser, otherwise you will not be able to log in.