There is no main.js file in Rocket.chat root directory after complete installation.

[tune6688]

Dear author:
This is wei, I am very interested in the rich text support function provided in your WideChat/Rocket.Chat. I have encountered a problem when downloading the source file through Github for installation. I hope you can give me some help, thank you very much!

The problem is:
There is no main.js file in Rocket.chat root directory after complete installation.

System info include:
Centos8
node v12.18.4
npm v6.14.6
WideChat v4.6.3

Install steps:
1.centos8 update
dnf update -y

2.install NodeJS
dnf install -y gcc-c++ make
curl -sL https://rpm.nodesource.com/setup_12.x | bash
dnf install -y nodejs

3.install GraphicsMagick
dnf install -y epel-release
dnf install -y GraphicsMagick
sudo npm install -g inherits n && sudo n 12.18.4

4.install MongoDB
sudo apt update
sudo apt install wget curl gnupg2 software-properties-common apt-transport-https ca-certificates lsb-release
curl -fsSL https://www.mongodb.org/static/pgp/server-5.0.asc|sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/mongodb.gpg
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/5.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-5.0.list
sudo apt update
sudo apt install mongodb-org
sudo systemctl restart mongod
systemctl status mongod
sudo systemctl enable mongod

5.install git

yum install git -y

6. Install RC
wget https://github.com/WideChat/Rocket.Chat/archive/refs/tags/v4.6.3.widechat-0.tar.gz
tar -xvf Rocket.Chat-4.6.3.widechat-0.tar.gz
cd /tmp/Rocket.Chat-4.6.3.widechat-0/server
npm install ### (Does it means to run install in the server directory?)
sudo mv /root/Rocket.Chat-4.6.3.widechat-0 /opt/Rocket.Chat
useradd -M rocketchat
usermod -L rocketchat
chown -R rocketchat:rocketchat /opt/Rocket.Chat
vi /lib/systemd/system/rocketchat.service
[Unit]
Description=The Rocket.Chat server
After=network.target remote-fs.target nss-lookup.target nginx.target mongod.target
[Service]
ExecStart=/usr/local/bin/node /opt/Rocket.Chat/main.js ### （There is no main.js file after installation）
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=rocketchat
User=rocketchat
Environment=MONGO_URL=mongodb://localhost:27017/rocketchat?replicaSet=rs01 MONGO_OPLOG_URL=mongodb://localhost:27017/local?replicaSet=rs01 ROOT_URL=http://localhost:3000/ PORT=3000
[Install]
WantedBy=multi-user.target
systemctl enable --now rocketchat.service
firewall-cmd --permanent --add-port=3000/tcp
firewall-cmd --reload

7. Login RC
http://URL:3000

It will be highly appreciated if you could give some instructions.