Merge pull request #3 from oz0820/main

Switched from bitsadmin to curl for file downloads

!!!-setup.bat

@@ -1,6 +1,9 @@
 @echo off
 chcp 65001 > nul
 
+where curl > nul 2>&1
+set "curlExists=%errorlevel%"
+
 mkdir bin
 cd bin
 
@@ -18,7 +21,13 @@ IF exist .\yt-dlp.exe (
 
 echo [Info] (1/3) ffmpegをダウンロードします
 timeout 3
-bitsadmin /transfer "ffmpeg" /priority FOREGROUND https://github.com/yt-dlp/FFmpeg-Builds/releases/download/latest/ffmpeg-master-latest-win64-gpl-shared.zip %~dp0/bin/ffmpeg-build.zip
+
+if %curlExists% equ 0 (
+    curl -L -o %~dp0/bin/ffmpeg-build.zip https://github.com/yt-dlp/FFmpeg-Builds/releases/download/latest/ffmpeg-master-latest-win64-gpl-shared.zip
+) else (
+    bitsadmin /transfer "ffmpeg" /priority FOREGROUND https://github.com/yt-dlp/FFmpeg-Builds/releases/download/latest/ffmpeg-master-latest-win64-gpl-shared.zip %~dp0/bin/ffmpeg-build.zip
+)
+
 timeout 1
 echo [Info] (2/3) ffmpegを解凍します
 call powershell -command "Expand-Archive ffmpeg-build.zip"
@@ -29,7 +38,12 @@ rmdir /Q /S ffmpeg-build
 
 echo [Info] (3/3) yt-dlp.exeをダウンロードします
 timeout 3
-bitsadmin /transfer "yt-dlp" /priority FOREGROUND https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp.exe %~dp0/bin/yt-dlp.exe
+
+if %curlExists% equ 0 (
+    curl -L -o %~dp0/bin/yt-dlp.exe https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp.exe
+) else (
+    bitsadmin /transfer "yt-dlp" /priority FOREGROUND https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp.exe %~dp0/bin/yt-dlp.exe
+)
 
 
 echo [Info] セットアップ完了