I tried this : https://docs.microsoft.com/en-us/composer/install-composer#build-composer-from-source
But got problems when run yarn at terminal in ...\BotFramework-Composer\Composer

It didn't run anymore...
Then , I tried other way with running yarn install && yarn build

Steps to reproduce the behavior:
@Khanh-Ngy What version of Node and what operating system are you using? I ran into a similar issue when I was using Node v15. Reverting to Node v14 resolved the issue.
Hi @Khanh-Ngy , reinforcing what @tdurnford said, right now we only support compiling and running on LTS versions of Node (v10, v12, v14 are ok). Can you revert to an LTS version and try compiling again?
@taicchoumsft thanks for the clarification.
In the Install Bot Framework Composer article we:
The fixing PR has been merged to master and the content will go live soon.
@Khanh-Ngy What version of Node and what operating system are you using? I ran into a similar issue when I was using Node v15. Reverting to Node v14 resolved the issue.
So many tks bro !!
I changed node version 15 to 14 && it worked fine <3
Most helpful comment
Hi @Khanh-Ngy , reinforcing what @tdurnford said, right now we only support compiling and running on LTS versions of Node (v10, v12, v14 are ok). Can you revert to an LTS version and try compiling again?