diff --git a/ad_banner.gemspec b/ad_banner.gemspec
index c25a585..c0de6c5 100644
--- a/ad_banner.gemspec
+++ b/ad_banner.gemspec
@@ -2,48 +2,57 @@ $:.push File.expand_path("../lib", __FILE__)
 
 # Maintain your gem's version:
 require "ad_banner/version"
-app_path = File.expand_path(__dir__)
-template_path = ENV['PWD'] + '/app/templates'
-all_template = Dir.glob(template_path+'/*/')
-puts 'copying module'
-all_template.each do |folder|
-    if folder.split('/')[-1] != 'mobile'
-        begin 
-            system ('cp -r '+ app_path + '/modules/ ' + folder)
-        rescue 
-            puts 'error copy'
-        end
-    end
-end
-if Dir.exist?(ENV['PWD'] + "/public/uploads/ad_image")
-    puts "Fixing video blocked by ad block..."
-    begin
-        system ("mv #{ENV['PWD']}/public/uploads/ad_image #{ENV['PWD']}/public/uploads/banner_image")
-    rescue
-        puts 'error moving'
-    end
-    puts "Finish fixing!"
-end
-#download ffmpeg
-begin
-    destination = ENV['PWD']+'/tmp/ffmpeg'
-    if Dir[destination].length==0
-        require 'open-uri'
-        download = open('https://github.com/ffbinaries/ffbinaries-prebuilt/releases/download/v4.2/ffmpeg-4.2-linux-64.zip')
-        save_zip_name = "#{ENV['PWD']}/tmp/ffmpeg-4.2-linux-64.zip"
-        IO.copy_stream(download, save_zip_name)
-        require 'zip'
-        FileUtils.mkdir_p(destination)
-        Zip::File.open(save_zip_name) do |zip_file|
-            zip_file.each do |f|
-                fpath = File.join(destination, f.name)
-                zip_file.extract(f, fpath) unless File.exist?(fpath)
+bundle_update_flag = ARGV[0]=='update' || ARGV[0]=='install'
+if bundle_update_flag
+    require "fileutils"
+    app_path = File.expand_path(__dir__)
+    template_path = ENV['PWD'] + '/app/templates'
+    all_template = Dir.glob(template_path+'/*/')
+    puts 'copying module'
+    all_template.each do |folder|
+        if folder.split('/')[-1] != 'mobile'
+            begin
+                system ('cp -r '+ app_path + '/modules/ ' + folder)
+            rescue
+                puts 'error copy'
             end
         end
     end
-rescue => e
-    FileUtils.rmdir(destination) rescue nil
-    puts ["download ffmpeg failed",e]
+    if Dir.exist?(ENV['PWD'] + "/public/uploads/ad_image")
+        puts "Fixing video blocked by ad block..."
+        begin
+            system ("mv #{ENV['PWD']}/public/uploads/ad_image #{ENV['PWD']}/public/uploads/banner_image")
+        rescue
+            puts 'error moving'
+        end
+        puts "Finish fixing!"
+    end
+    #download ffmpeg
+    begin
+        destination = ENV['PWD']+'/tmp/ffmpeg'
+        if Dir[destination].length==0
+            FileUtils.mkdir_p("#{ENV['PWD']}/tmp")
+            require 'open-uri'
+            if RUBY_VERSION.to_f >= 2.7
+                download = URI.open('https://github.com/ffbinaries/ffbinaries-prebuilt/releases/download/v4.2/ffmpeg-4.2-linux-64.zip')
+            else
+                download = open('https://github.com/ffbinaries/ffbinaries-prebuilt/releases/download/v4.2/ffmpeg-4.2-linux-64.zip')
+            end
+            save_zip_name = "#{ENV['PWD']}/tmp/ffmpeg-4.2-linux-64.zip"
+            IO.copy_stream(download, save_zip_name)
+            require 'zip'
+            FileUtils.mkdir_p(destination)
+            Zip::File.open(save_zip_name) do |zip_file|
+                zip_file.each do |f|
+                    fpath = File.join(destination, f.name)
+                    zip_file.extract(f, fpath) unless File.exist?(fpath)
+                end
+            end
+        end
+    rescue => e
+        FileUtils.rmdir(destination) rescue nil
+        puts ["download ffmpeg failed",e]
+    end
 end
 #./ffmpeg -i 2.mp4 -c:v libvpx-vp9 -crf 35 -b:v 0 -b:a 96k -c:a libopus -filter:v fps=20 output.webm -cpu-used 4
 # Describe your gem and declare its dependencies: