Fix issue where engines would not be reported unless a system engine was installed

src/api_server.py

@@ -535,13 +535,15 @@ def renderer_info():
     renderer_data = {}
     for engine_name in RenderWorkerFactory.supported_renderers():
         engine = RenderWorkerFactory.class_for_name(engine_name).engine
-        if engine.default_renderer_path():
 
-            # Get all installed versions of engine
+        # Get all installed versions of engine
+        installed_versions = EngineManager.all_versions_for_engine(engine_name)
+        if installed_versions:
+            install_path = installed_versions[0]['path']
             renderer_data[engine_name] = {'is_available': RenderQueue.is_available_for_job(engine.name()),
-                                'versions': EngineManager.all_versions_for_engine(engine_name),
+                                'versions': installed_versions,
                                 'supported_extensions': engine.supported_extensions,
-                                'supported_export_formats': engine().get_output_formats()}
+                                'supported_export_formats': engine(install_path).get_output_formats()}
     return renderer_data
 
 

src/engines/base_engine.py

@@ -24,9 +24,9 @@ class BaseRenderEngine(object):
     @classmethod
     def default_renderer_path(cls):
         path = None
-        try:
+        try:  # Linux and macOS
             path = subprocess.check_output(['which', cls.name()], timeout=SUBPROCESS_TIMEOUT).decode('utf-8').strip()
-        except subprocess.CalledProcessError:
+        except (subprocess.CalledProcessError, FileNotFoundError):
             for p in cls.install_paths:
                 if os.path.exists(p):
                     path = p

src/engines/downloaders/blender_downloader.py

@@ -53,7 +53,7 @@ class BlenderDownloader:
             versions_data = [x for x in versions_data if x['cpu'] == cpu]
 
         for v in versions_data:
-            v['url'] = os.path.join(base_url, v['file'])
+            v['url'] = base_url + '/' + v['file']
 
         versions_data = sorted(versions_data, key=lambda x: x['version'], reverse=True)
         return versions_data

src/engines/downloaders/ffmpeg_downloader.py

@@ -87,7 +87,7 @@ class FFMPEGDownloader:
             release_dir = 'releases' if version == cls.get_linux_versions()[0] else 'old-releases'
             remote_url = os.path.join(cls.linux_url, release_dir, f'ffmpeg-{version}-{cpu}-static.tar.xz')
         elif system_os == 'windows':
-            remote_url = os.path.join(cls.windows_download_url, version, f'ffmpeg-{version}-full_build.zip')
+            remote_url = f"{cls.windows_download_url.strip('/')}/{version}/ffmpeg-{version}-full_build.zip"
 
         # Download and extract
         try: