Keep vertical synchronization enabled in the Graphics settings, so the frame rate stays locked to your monitor's refresh rate — disable it only if you are certain of what you are doing. A GPU pushed to 100% utilization runs into its TDP limits and throttles, turning smooth play into a stutter.

After downloading, unpack the archive and — before the first launch — drag Medivia Online into the Applications folder: open Finder, click Downloads in the sidebar, then drag the app onto Applications in that same sidebar. The client can only update itself from inside Applications — launched from Downloads or the desktop it will still start, but every update attempt will end in an error.

macOS blocks the first launch of Medivia Online because the app is not signed by an identified developer. To open it anyway:
1. Double-click Medivia Online in Applications and dismiss the warning — this first blocked attempt tells macOS you want to run the app.
2. Control-click (or right-click) the app and choose Open. If the dialog only offers Cancel / Move to Trash (no Open button), close it and repeat right-click → Open once more — the Open button appears on the second attempt.
3. On macOS 13 Ventura or newer (on macOS 15 Sequoia the right-click trick no longer exists) open System Settings → Privacy & Security, scroll down to the Security section and click Open Anyway next to the message about Medivia Online, then confirm.
Once the app has opened this way a single time, every later launch works like any other app. Do not use Launchpad for the first launch — it never offers the Open option.