Download the .exe file.
Run the file. A wizard will then guide you through the rest of the installation.
Download the AppImage file.
Right-click on the file and select Properties on the context menu.
Navigate to Permissions tab and enable checkbox that says “Allow executing file as program”.
Close the dialog.
Double-click on the AppImage file to run the application.
For more information see this forum thread.
MacOS / OSX¶
Download the .dmg file.
Open downloaded dmg file.
Drag the Synfig Studio icon file into your Applications directory. Wait for the copy process to be completed.
Run Synfig Studio from your Applications directory.
If you get an error message like “can’t be opened because it comes from a non identified developer”, then do the following:
Locate the Synfig Studio app in Finder (don’t use Launchpad to do this - Launchpad doesn’t allow you to access the shortcut menu)
Control-click the app icon, choose “Open” from the shortcut menu.
The app is saved as an exception to your security settings, and you can open it in the future by double-clicking it just as you can any registered app.
You can also grant an exception for a blocked app by clicking the “Open Anyway” button in the General pane of Security & Privacy preferences. This button is available for about an hour after you try to open the app. To open this pane, choose Apple menu > System Preferences, click Security & Privacy, then click General.
For more details please refer to this page.