addition: fixes for docs

CMakeLists.txt

@@ -22,18 +22,27 @@ set(CPM_DOWNLOAD_LOCATION
 )
 
 if(NOT EXISTS ${CPM_DOWNLOAD_LOCATION})
+
     message(STATUS "Downloading CPM.cmake...")
 
     file(
         DOWNLOAD
-        https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake
-        ${CPM_DOWNLOAD_LOCATION}
+        "https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake"
+        "${CPM_DOWNLOAD_LOCATION}"
+        STATUS download_status
     )
+
+    list(GET download_status 0 status_code)
+
+    if(NOT status_code EQUAL 0)
+        message(FATAL_ERROR
+            "Failed to download CPM.cmake"
+        )
+    endif()
+
 endif()
 
-include(${CPM_DOWNLOAD_LOCATION})
-
-include(cmake/CPM.cmake)
+include("${CPM_DOWNLOAD_LOCATION}")
 
 CPMAddPackage(
     NAME arraylist