TL;DR: Click "More info" → "Run anyway" on the SmartScreen dialog, or temporarily disable your antivirus and retry. Re-download if the file is corrupt.

All Errors & Fixes

Obsidian Not Installing on Windows 11 – How to Fix

Four verified fixes for the most common reasons Obsidian fails to install on Windows 10 and Windows 11. Follow in order — most users are fixed by Fix 1 or Fix 2.

Why Is Obsidian Not Installing on Windows 11?

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Windows SmartScreen Block 95% of cases

SmartScreen shows a warning for any newly released executable that hasn't yet accumulated enough reputation in Microsoft's database. This is the #1 cause.

🦠

Antivirus Interference Common

Real-time antivirus protection (Windows Defender, AVG, Avast, Malwarebytes) can quarantine or block the installer mid-write.

📁

Permission or Path Error Occasional

Installing to a protected system folder (e.g. C:\Program Files) without admin rights causes a silent failure.

💾

Corrupted Download Occasional

A partial or interrupted download produces a damaged .exe that fails to extract.

Step-by-Step Fixes

1

Bypass Windows SmartScreen

Fix first

When you see "Windows protected your PC":

Click More info (blue link below the warning text).
Click Run anyway. Installation will proceed normally.
Why is it safe? The installer is downloaded directly from github.com/obsidianmd/obsidian-releases — the official Obsidian repository. SmartScreen flags it because Obsidian releases updates frequently and each new .exe starts with zero reputation.
2

Disable Antivirus Temporarily

Right-click your antivirus icon in the system tray → Pause / Disable for 10 minutes.
Run the Obsidian installer again.
Re-enable antivirus immediately after installation completes.

For Windows Defender: Settings → Windows Security → Virus & threat protection → Manage settings → Real-time protection → Off.

3

Re-download a Fresh Installer

Delete the existing Obsidian-1.12.7.exe from your Downloads folder.
Download a fresh copy using the button below.
Check that the file size is ~90 MB — a smaller file indicates an incomplete download.
⬇ Download fresh Obsidian installer
4

Run as Administrator

Right-click Obsidian-1.12.7.exeRun as administrator.
Click Yes in the UAC prompt.
If this succeeds, your user account lacks write access to the default install path — consider installing to C:\Users\YourName\AppData\Local\Obsidian instead.

Frequently Asked Questions

Related fixes: