If the system understands it as a script so it may be the script ...
Anyway, check the downloading procedure once again -
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how can i down load an expert advisor for demo testing from the market
https://www.mql5.com/en/articles/586
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_buy

How to Test a Trading Robot Before Buying
- www.mql5.com
Buying a trading robot on MQL5 Market has a distinct benefit over all other similar options - an automated system offered can be thoroughly tested directly in the MetaTrader 5 terminal. Before buying, an Expert Advisor can and should be carefully run in all unfavorable modes in the built-in Strategy Tester to get a complete grasp of the system...

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I downloaded an EA from the marketplace for MT4.
But on downloading, EA gets placed in the SCRIPT folder, so won't load onto a chart. I tried moving it to the EXPERTS folder, but when I tried to put it on a chart the journal states it is not an EA.
I've spoken to the developer, who has had no trouble loading it correctly.
Any ideas what is going on? I've had previous issues with McAffee anti virus which kindly deleted my terminal file, but I solved that ok.
A