Fixed install_imagemagick.bat script to detect latest version url fro…

…m official download page.

ci/windows/install_imagemagick.bat

@@ -5,9 +5,21 @@
 :: https://imagemagick.org/script/download.php#windows
 
 echo Installing ImageMagick...
-set IKMAGEMAGICK_URL=https://imagemagick.org/archive/binaries/ImageMagick-7.1.1-37-portable-Q16-x64.zip
-set IKMAGEMAGICK_FILE=%TEMP%\imagemagick.zip
-set IKMAGEMAGICK_INSTALL_DIR=%TEMP%\imagemagick
+set IMAGEMAGICK_URL=https://imagemagick.org/script/download.php
+set IMAGEMAGICK_FILE=%TEMP%\imagemagick.zip
+set IMAGEMAGICK_INSTALL_DIR=%TEMP%\imagemagick
+set IMAGEMAGICK_TEMP_FILE=%TEMP%\imagemagick.temp.txt
+
+echo Searching for a ImageMagick download link from %IMAGEMAGICK_URL%.
+powershell -command "(Invoke-WebRequest -Uri $Env:IMAGEMAGICK_URL).links.href | where {$_ -match '-portable-Q16-x64.zip'}">"%IMAGEMAGICK_TEMP_FILE%"
+if errorlevel 1 (
+  echo Command failed. Unable to check for ImageMagick latest portable version binaries.
+  exit /B %errorlevel%
+)
+set /p IMAGEMAGICK_URL=<"%IMAGEMAGICK_TEMP_FILE%"
+echo Found download url: %IMAGEMAGICK_URL%
+if [%IMAGEMAGICK_URL%] == [] exit /B 1
+echo.
 
 :: Check that 7zip is installed
 echo Searching for 7zip executable...
@@ -21,14 +33,14 @@ echo 7zip found.
 echo.
 
 :: Download installer
-echo Downloading %IKMAGEMAGICK_URL%...
-python -c "import urllib.request; import os; urllib.request.urlretrieve(os.getenv('IKMAGEMAGICK_URL'),os.getenv('IKMAGEMAGICK_FILE'));"
+echo Downloading %IMAGEMAGICK_URL%...
+python -c "import urllib.request; import os; urllib.request.urlretrieve(os.getenv('IMAGEMAGICK_URL'),os.getenv('IMAGEMAGICK_FILE'));"
 if errorlevel 1 (
   echo Command failed. Unable to download ImageMagick binaries.
   exit /B %errorlevel%
 )
-if NOT EXIST "%IKMAGEMAGICK_FILE%" (
-  echo Download failed. The file '%IKMAGEMAGICK_FILE%' is not found.
+if NOT EXIST "%IMAGEMAGICK_FILE%" (
+  echo Download failed. The file '%IMAGEMAGICK_FILE%' is not found.
   exit /B %errorlevel%
 )
 echo done.
@@ -38,7 +50,7 @@ echo.
 mkdir %TEMP%\imagemagick 1>NUL 2>NUL
 echo Extracting content to installation directory...
 REM WARNING. THE FOLLOWING COMMAND EXACT ALL FILES IN THE ARCHIVE TO THE SAME LOCATION DISREGARDING INTERNAL DIRECTORY STRUCTURE!!
-7z e %IKMAGEMAGICK_FILE% -o%IKMAGEMAGICK_INSTALL_DIR% -aoa
+7z e %IMAGEMAGICK_FILE% -o%IMAGEMAGICK_INSTALL_DIR% -aoa
 if errorlevel 1 (
   echo Failed to decompress ImageMagick binary installer.
   exit /B %errorlevel%
@@ -48,7 +60,7 @@ echo.
 
 :: Searching for imagemagick executable
 echo Searching for imagemagick executable...
-set PATH=%IKMAGEMAGICK_INSTALL_DIR%;%PATH%
+set PATH=%IMAGEMAGICK_INSTALL_DIR%;%PATH%
 where magick.exe 1>NUL 2>NUL
 if errorlevel 1 (
   echo Error: ImageMagick not installed on system.