Did you see your purchase in your profile here https://www.mql5.com/en/users/zhangzhongpeng/market ?
If yes so check the following:
- fill community tab with your forum login and forum password;
- your forum login is zhangzhongpeng (do not use your email for login; and do not use password which you may receive from facebook or google for example; change your password in case you password is facebook or google related one).
read this thread for more information: https://www.mql5.com/en/forum/371291
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My example:
Forum on trading, automated trading systems and testing trading strategies
...
Sergey Golubev, 2021.01.04 16:50
..
1. I made Community login:
2. and checked in Metatrader journal:
3. I checked Internet Explorer installed on computer:
4. I checked the settings of Internet Explorer: yes, I can use the chat with not a problem by sending/receiving the messages:
5. Signal tab works:
6. Market tab works:

- 2021.06.14
- www.mql5.com
And you can refresh the Market tab of your Metatrader (for new/old purchases to be listed in the Market tab) in the following way:
Forum on trading, automated trading systems and testing trading strategies
The purchased tab is only showing the last two purchases
Alexey Petrov, 2021.01.19 11:17
Even if a Market product is removed from the showcase, those who already purchased it, can install it anytime from their MetaTrader terminal (Market \ Purchased section).
In case you don't see the product on the list of your purchases in the terminal, try the following:
- Close all your MetaTrader terminals
- Go to C:\Users\{user name}\AppData\Roaming\MetaQuotes\Terminal\Community
- Delete all files starting from mql4.market.* and mql5.market.*
- Open MetaTrader terminal
- Try to install product again

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