I can’t install this app
each time it completes, it shows an error message and recommend texting the author
If the app is not downloading most likely an anti-virus issue. Can whitelist wemod exe’s
Welcome to the community @nguyentranthuong2000. 
Please use the search feature before posting, as this has been addressed before and you would have gotten a likely fix almost immediately.
See this thread for troubleshooting: I can’t Install WeMod.