WorldLine setup help

Install and sign in to WorldLine

Use the latest Windows installer, finish first-run setup, and complete Patreon access checks from one setup page.

This page combines the real installation flow, runtime checks, and Patreon sign-in steps in one place.

Before installInstall stepsFirst sign-inTroubleshootingMembership guide
Before you installWindows 10/11 x64
Before you install
Checking the items below before you run the installer prevents most first-run issues.
  • CheckSupported environment

    WorldLine is documented for Windows 10 / 11 64-bit environments.

  • CheckInstaller type

    Use the latest public x64 installer from the download page.

  • CheckPermission prompts

    You may need to allow Windows administrator or UAC prompts during installation.

  • CheckBrowser access

    First-time sign-in requires your default browser and an active internet connection.

  • CheckBase membership check

    A free Patreon membership is enough to verify access to the core WorldLine flow.

  • Check.NET runtime

    If the app does not start at all or Windows asks for a runtime, verify that .NET 10 Desktop Runtime is available.

  • CheckWebView2 runtime

    If the window opens but the internal UI is blank or initialization fails, verify WebView2 Runtime.

Required runtimes

If the app will not launch or the embedded UI looks broken, verify these two runtimes first.

Install stepsx64 installer
Install steps
Follow the sequence below for the normal installation flow.
  1. 1

    Download the latest installer from the public download page

    Get the latest WorldLine installer from the public download page.

  2. 2

    Run the installer

    Open the downloaded installer file and follow the setup wizard.

  3. 3

    Allow Windows prompts

    Approve security prompts, UAC, or administrator confirmations so setup can continue.

  4. 4

    Launch the app for the first time

    After setup finishes, launch WorldLine and confirm that the first-run screen appears correctly.

  5. 5

    If the app does not start, check the .NET runtime

    If the executable will not open or Windows asks for required components, install .NET 10 Desktop Runtime and try again.

  6. 6

    If the window opens but the embedded UI fails, check WebView2

    If the screen is blank, sign-in does not render, or a WebView2 error appears, install WebView2 Runtime and relaunch the app.

Open download page
First sign-inPatreon
First sign-in
On first launch, WorldLine uses your default browser to verify Patreon membership access.
  1. 1

    Start Patreon sign-in from the app

    Press the sign-in button in the app and your default browser will open the Patreon authorization flow.

  2. 2

    Use the same browser session that is already signed in

    Using the browser session where your Patreon account is already signed in reduces callback and session errors.

  3. 3

    Finish the authorization within five minutes when possible

    The request does not stay valid for long, so complete the sign-in and confirmation flow within about five minutes.

  4. 4

    Confirm the callback page, then return to the app

    Once the browser shows the completion page, return to WorldLine and wait for the access state to update.

  5. 5

    If waiting takes too long, refresh status or relaunch the app

    If the app keeps waiting for verification, refresh the status or relaunch the app and retry the session check.

CheckpointsChecks worth doing before sign-in
  • A free Patreon membership is enough for the base WorldLine experience.
  • If the browser does not open, verify your default browser settings and popup restrictions first.
  • If a request expired or sat open too long, start a new sign-in flow and finish it within five minutes.
  • If the browser finishes but the app still waits, signing out and signing in again often resets the session cleanly.
Troubleshooting
Common symptoms
Troubleshooting
Use the symptom list below to quickly narrow down common installation and Patreon sign-in issues.

  • The app does not start, or Windows asks to install .NET

    Microsoft.WindowsDesktop.App 10.0.0Microsoft.NETCore.App 10.0.0
    • Install the official .NET 10 Desktop Runtime x64 first, then launch WorldLine again.
    • If it is already installed, restart Windows once and retry.
    • If you used an older installer or a test build, reinstall from the latest public download page.

  • You see WebView2 Runtime Required or WebView2 initialization failed

    WebView2 Runtime RequiredWebView2 initialization failed
    • Install the official WebView2 Runtime and relaunch WorldLine.
    • Apply the same check if the app window opens but the internal UI is blank or buttons do not react.
    • If the runtime is already present, reboot once and verify that Windows registered it correctly.

  • You click Patreon sign-in, but no browser opens

    OPEN_BROWSER_FAILED
    • Confirm that Windows has a working default browser configured.
    • Close the app completely, open it again, and retry the sign-in button.
    • Check whether popup blocking, security policy, or remote-environment restrictions are blocking browser launch.

  • The authorization page expired or a failure page appears

    REQUEST_EXPIREDAUTH_CODE_MISSINGOAUTH_ERROR:*
    • Start Patreon sign-in again from the app so you get a fresh request.
    • Try to finish the authorization within five minutes, and restart from the beginning if you waited too long.
    • Retry in the same browser session where Patreon is already signed in.

  • The app stays in a waiting-for-verification state for too long

    AUTH_TIMEOUTAUTH_POLL_FAILED
    • First confirm that the browser really showed the completion page.
    • Return to the app, refresh the status, or relaunch the app and retry the session check.
    • If your network is unstable, wait a moment and start a fresh sign-in request.

  • You signed in, but the app falls back to a locked state again

    SESSION_EXPIREDSESSION_NOT_FOUNDTOKEN_NOT_FOUNDPATRON_API_UNAVAILABLE:*
    • Try the in-app status refresh first.
    • If it keeps repeating, sign out and run Patreon sign-in again to get a fresh session.
    • If Patreon or the network is responding inconsistently, wait a little and retry later.

  • The app says a membership is required

    MEMBERSHIP_REQUIRED
    • The base WorldLine flow is available with a free Patreon membership.
    • If you do not have a Patreon membership yet, join first or confirm that your existing account still has access.
    • Use the Patreon section on the download page to review membership differences and the join flow.
PatreonFree membership supported
Patreon membership and access checks
The installer is public, but the first launch continues into Patreon membership verification. A free Patreon membership is enough for the core WorldLine feature set.
  • A free Patreon membership is enough to confirm access to the base feature set.
  • Fellowship is for additional supporter benefits and is not required just to install or launch the app.
  • If you see MEMBERSHIP_REQUIRED, verify your membership state and restart the sign-in flow from the app.
Open the membership section on the download pageOpen Patreon
Help links
Help links
If the issue continues, open the installer page, membership guide, release notes, and FAQ directly from the links below.
.NET 10 Desktop RuntimeWebView2 Runtime

WorldLine help pages

Check the dedicated WorldLine pages first for installation, the in-app guide, FAQs, and release notes.

WorldLine overview

See what WorldLine does for branching saves, repeat runs, and timeline-based restore workflows.

Learn more

WorldLine guide

A detailed user guide for managing game saves with WorldLine.

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WorldLine FAQ

Read answers about saves, backups, downloads, Patreon access, and support.

Learn more

Release notes

Check the latest WorldLine updates, release history, and patch note highlights.

Learn more