You can install the indicator directly from MT5 (not from webpage).
For example:
Forum on trading, automated trading systems and testing trading strategies
I can't login to MQL5 community on MT5
Sergey Golubev, 2023.04.20 12:35
The people are buying on the following way:
1. go to showcase of the Market to select the product (free one or paid/commercial one) - https://www.mql5.com/en/market (use browser)
2. after that - go to the search on the top right corner of Metatrader and type the name of the product which was pre-selected in the browser (and click "search"):

3. the search tab will be opened, so click on "Products" and select the pre-selected product in this search results
4. after that - click on the link and install.
More -
Where can I see my purchases?
https://www.mql5.com/en/forum/9950/page70#comment_2564931
How to Install an Earlier Purchased Application
https://www.metatrader5.com/en/terminal/help/market/market_buy
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hello
In my PC, I have two MT5 accounts with different brokers. The market indicator I install is currently applied to the MT5 account of the most recently installed broker. How can I make it apply to the previous one?