Changelog
Every release of the MJOLNIR modding platform for Halo Campaign Evolved — the launcher, the tag editor, the runtime and the signed code mods. Newest first.
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Installs the runtime, manages your mods, and launches Halo Campaign Evolved.
Browse and edit the Blam tags, textures, audio and scripts inside your installed game.
The signed UE4SS bundle every mod runs on, with the signatures and config this game needs.
The first-party script mods, built in CI and covered by one Ed25519 signature.
All releases
Point the launcher at your game
If MJOLNIR cannot find Halo Campaign Evolved, you can now choose the folder yourself instead of being stuck on the Game Not Found screen.
Choose which installation you are editing
The setup form now takes the game folder itself, and the installation you have open is named at the bottom of the left panel, with a way to change it.
Swap textures from inside a mod project
Replace any texture's pixels with your own image from inside a mod project, and have it travel with your tag and script edits when you test, export or publish.
Read, edit and compile the campaign's mission scripts
The campaign's original mission scripts ship inside the game. The Tag Editor now shows them, lets you edit them, and compiles your changes back in.
Twice as many textures preview
Around half the game's textures would not preview at all. 4,787 of 4,844 now decode, up from 2,421.
Hotfix: audio plays in the installed app
Fixes 0.6.0, in which the audio browsing added one release earlier could not actually play anything once the app was installed.
Browse and play the game's audio
The Tag Editor opens the game's sound archives — around 6 GB it could not read before — and lets you browse, name and play 194,559 Wwise audio files.
Live tag editing in the running game
Change a tag value and see it in Halo Campaign Evolved immediately — no rebuild, no repacking, and no restarting the game.
Verifies author-signed mod archives
The launcher refuses to install a community mod whose author signature does not verify, pins each mod's signing key, and warns you when a key changes or is revoked.
FlyCam actually flies
MJOLNIRFlyCam 1.1.0 fixes a camera that never moved in 1.0.0, hides the first-person arms and weapon so external shots look right, and clears two crashes.
Link a hub account instead of pasting an API key
Publishing now uses the same pairing flow as the launcher — approve a code in your browser — instead of minting an API key by hand and pasting it into a text box.
Author, test and publish mods without leaving the editor
Mods become saved projects rather than one-off exports: keep a list of your edits, test them in the game, and publish to the MJOLNIR Hub from inside the editor.
No Oodle DLL required
The Tag Editor now reads the game's compressed containers on its own, so you no longer need to supply a proprietary Oodle DLL before it will open anything.
Setup installs the mods a new install needs
First-time setup no longer finishes with a modding framework and nothing to run in it, and the rest of the signed mods are now listed in My Mods with an Install button.
The signed badge tells the truth, and updates install quietly
Mods installed by an earlier launcher now verify as signed instead of reading unverified forever, and automatic updates stop interrupting you with an installer prompt.
The signed runtime replaces the modpack
The launcher installs a signed runtime bundle instead of the old modpack, refuses one whose signature does not verify, and stops overwriting your settings.
Automatic updates work for the first time
Fixes automatic updates, which had never worked in any released build: the launcher was silently blocked from checking, and reported the block as "up to date".
The hub release: browse, rate and update mods in the launcher
The launcher becomes a full hub client: mod pages, ratings and comments built in, one Updates screen for everything, and sign-in by pairing.
A Tools tab, and the Tag Editor
Adds a Tools tab that installs and updates companion apps on demand, starting with the new MJOLNIR Tag Editor for browsing and editing the game's tags and textures.
MJOLNIRCore installs itself on a fresh setup
MJOLNIRCore 1.0.1 marks itself as a mod that first-time setup should install, and fixes existing installs wrongly reading as modified.
The first-party mods, signed and versioned
The first-party script mods, built in CI, each carrying its own version, and all covered by one Ed25519 signature the launcher checks before installing.
Republished so existing installs are offered the migration
The same bundle as 1.0.0, republished under a new major version so that installs still carrying the old modpack are actually offered the upgrade.
A signed runtime replaces the modpack
The first MJOLNIR Runtime: the UE4SS modding framework and the config this game needs, as a signed bundle the launcher verifies before installing.
Browse and edit the game's tags and textures
Browse every asset in your installed copy of Halo Campaign Evolved, read its Blam tag fields in a Guerilla-style form, preview textures, and export edits.
Security: replaces the update signing key
Replaces the key that automatic updates are verified against, after the previous private key was found committed to the public repository.
Update notifications you cannot miss
Fixes automatic updates, which could not verify a download and so never installed one, and adds an update badge that persists after you dismiss the banner.
Install, verify and toggle the mod framework from the launcher
The launcher now installs the UE4SS modding framework for you, verifies every file it wrote, and supports Game Pass copies of Halo Campaign Evolved as well as Steam.
The Windows installer builds again
Fixes the Windows installer, which had stopped building since the branded artwork was added in 0.1.3, leaving several releases without one.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.2.4.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.2.3.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.2.2.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.2.1.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.2.0.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.1.10.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.1.9.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.1.8.
Release pipeline only
A version bump published while wiring up the signing key that lets released builds be verified. Nothing in the launcher itself changed since 0.1.7.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.1.6.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.1.5.
Release pipeline only
A version bump published while fixing the automated release workflow. Nothing in the launcher itself changed since 0.1.4.
Release pipeline only
Adds an automatic Discord announcement when a release is published. Nothing in the launcher itself changed since 0.1.3.
Fixes a startup crash, and brands the installer
Fixes a crash that stopped the launcher opening at all on some installs, and gives the Windows installer proper MJOLNIR branding.
Release pipeline only
A version bump published to exercise the release pipeline. Nothing in the launcher itself changed since 0.1.1.
Automatic updates
The launcher can now check for new versions and install them itself, instead of asking you to download a new installer by hand.
The first MJOLNIR Launcher build
The first published build of the MJOLNIR Launcher for Halo Campaign Evolved, alongside the mjolnircore.com website and the automated release pipeline behind both.