Privacy
Updated: October 11, 2026
This page explains data handling by the official Arcadium Client website and Windows launcher.
The website
Cloudflare Pages serves the website, and GitHub Releases hosts installer downloads. This site has no advertisements, analytics or contact forms. The site does not require an account or store your launcher credentials.
Cloudflare and GitHub process connection information, such as IP addresses, to provide and protect their services. See their privacy policies for details.
Cloudflare Privacy Policy ↗ · GitHub Privacy Statement ↗
Data on your PC
The launcher stores settings, game files and account credentials on your PC. Windows account credentials are protected with DPAPI for the current Windows user. You can choose a storage directory during setup; the default is %APPDATA%/Arcadium/ArcadiumClient. The distributed installer contains no saved accounts.
External services
Microsoft, Xbox and Mojang handle sign-in, ownership checks and profile retrieval. Sign-in takes place in your browser. Installing games, Java and mods contacts Mojang, Modrinth and the components' download providers. External services and additional mods have their own privacy policies.
Discord Rich Presence
When Discord RPC is enabled in the launcher, Arcadium sends its running activity, Minecraft version and elapsed time to Discord. You can manage this through the launcher setting and Discord's activity-sharing settings.
Controls and questions
Launcher data is managed in its local directory. Questions and bugs can be reported through GitHub Issues. Do not include passwords, tokens or personal information in public posts.