small improvement (#3277)

install.sh

@@ -144,6 +144,7 @@ config_after_install() {
 install_x-ui() {
     cd /usr/local/
 
+    # Download resources
     if [ $# == 0 ]; then
         tag_version=$(curl -Ls "https://api.github.com/repos/MHSanaei/3x-ui/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
         if [[ ! -n "$tag_version" ]]; then
@@ -174,30 +175,35 @@ install_x-ui() {
             exit 1
         fi
     fi
+    wget -O /usr/bin/x-ui-temp https://raw.githubusercontent.com/MHSanaei/3x-ui/main/x-ui.sh
 
+    # Stop x-ui service and remove old resources
     if [[ -e /usr/local/x-ui/ ]]; then
         systemctl stop x-ui
         rm /usr/local/x-ui/ -rf
     fi
 
+    # Extract resources and set permissions
     tar zxvf x-ui-linux-$(arch).tar.gz
     rm x-ui-linux-$(arch).tar.gz -f
+    
     cd x-ui
     chmod +x x-ui
+    chmod +x x-ui.sh
 
     # Check the system's architecture and rename the file accordingly
     if [[ $(arch) == "armv5" || $(arch) == "armv6" || $(arch) == "armv7" ]]; then
         mv bin/xray-linux-$(arch) bin/xray-linux-arm
         chmod +x bin/xray-linux-arm
     fi
-
     chmod +x x-ui bin/xray-linux-$(arch)
-    cp -f x-ui.service /etc/systemd/system/
-    wget -O /usr/bin/x-ui https://raw.githubusercontent.com/MHSanaei/3x-ui/main/x-ui.sh
-    chmod +x /usr/local/x-ui/x-ui.sh
+
+    # Update x-ui cli and se set permission
+    mv -f /usr/bin/x-ui-temp /usr/bin/x-ui
     chmod +x /usr/bin/x-ui
     config_after_install
 
+    cp -f x-ui.service /etc/systemd/system/
     systemctl daemon-reload
     systemctl enable x-ui
     systemctl start x-ui