v4 and v5 can run simultaneously — no v4 detection or cleanup

[kKaskak]

v5 uses a different mutex name and AppId from v4. The Inno installer doesn't detect or close v4's Stremio.exe. Both fight over port 11470. Protocol handlers (stremio:, magnet:, .torrent) are silently overwritten on install and deleted on v5 uninstall even if v4 is still installed. Need v4 detection in installer and migration logic.

[kKaskak]

Verdict: valid with edge cases.

The installer uses a v5 AppId/exe/protocol registration with no visible v4 detection or shutdown path, and uninstall entries use uninsdeletekey for protocol keys. That makes the migration concern valid. Edge cases: the exact overwrite/delete behavior depends on per-user/per-machine registry state and install order, and some parallel v4/v5 testing may be intentional. The installer should still detect v4 and make migration/association ownership explicit.