How to verify an EA on the marketplace?

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Just like I said in the subject. What do you check to ensure that an EA works before buying?
 

This is the thread (first page of the thread) as an example about how to install:
https://www.mql5.com/en/forum/341377 

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Two blog posts with instruction about HowTo:

How to buy, install, test and use a MT5 Expert Advisor 

How to buy, install, test and use a MT4 Expert Advisor

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I cant install the purchased EA in MT5 platform
I cant install the purchased EA in MT5 platform
  • 2020.05.21
  • www.mql5.com
Forum on trading, automated trading systems and testing trading strategies. Metatrader 5 strategy tester and mql5 cloud network. It should look like this: ----------------- avx versions - post #1370. Product is purchased but not downloaded yet
 
How to Test a Trading Robot Before Buying
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, seeing that every Expert Advisor offered on MQL5 Market has a demo version available.
How to Test a Trading Robot Before Buying
How to Test a Trading Robot Before Buying
  • 2012.11.09
  • 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.
 

More - 

TIPS FOR PURCHASING A PRODUCT ON THE MARKET. STEP-BY-STEP GUIDE 

The correct way to choose an Expert Advisor from the Market 

Tips for Purchasing a Product on the Market. Step-By-Step Guide
Tips for Purchasing a Product on the Market. Step-By-Step Guide
  • 2015.05.25
  • www.mql5.com
This step-by-step guide provides tips and tricks for better understanding and searching for a required product. The article makes an attempt to puzzle out different methods of searching for an appropriate product, sorting out unwanted products, determining product efficiency and essentiality for you.
 
Thanks for all the useful information.
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