Windows Update Taking Forever to Download or Install: How to Fix

Windows Update can genuinely take a long time — but there's a difference between slow and broken. Here's how to tell them apart and fix the broken case.

Is It Actually Stuck?

Before doing anything, check if it's working:

Open Task Manager → Performance → Network — if network activity is present, it's downloading
Check disk activity — if the drive light is blinking, it's installing
Wait 30-60 minutes for large feature updates — some take this long at a fixed percentage

If there's zero network and disk activity for over an hour: it's stuck.

Fix 1: Run Windows Update Troubleshooter

Win + I → System → Troubleshoot → Other troubleshooters → Windows Update → Run

This fixes the most common causes automatically: stopped services, corrupted cache, wrong permissions.

Fix 2: Restart Windows Update Service

Restart-Service wuauserv -Force
Restart-Service bits -Force
Restart-Service cryptSvc -Force

Then check for updates again.

Fix 3: Clear the Update Cache

Stop-Service wuauserv -Force
Stop-Service bits -Force

# Delete downloaded update files
Remove-Item "C:\Windows\SoftwareDistribution\Download\*" -Recurse -Force -ErrorAction SilentlyContinue

Start-Service wuauserv
Start-Service bits

Windows re-downloads only what's needed. Often fixes downloads stuck at 0%.

Fix 4: Switch Delivery Optimization Source

If downloads are slow, Windows may be downloading from peers instead of Microsoft servers.

# Force downloads from Microsoft only (no peer sharing)
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\DeliveryOptimization" `
  -Name "DODownloadMode" -Value 0 -Type DWord

Or: Win + I → Windows Update → Advanced options → Delivery Optimization → turn off Allow downloads from other PCs.

Fix 5: Check and Fix DNS

Slow DNS resolution causes slow update metadata downloads.

# Test Microsoft update server
Test-NetConnection -ComputerName windowsupdate.microsoft.com -Port 443

# Switch to faster DNS
Set-DnsClientServerAddress -InterfaceAlias "Wi-Fi" -ServerAddresses ("1.1.1.1", "8.8.8.8")
Clear-DnsClientCache

Fix 6: Full Reset of Update Components

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver

ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old

net start wuauserv
net start cryptSvc
net start bits
net start msiserver

Fix 7: DISM and SFC

Corrupted system files cause update failures and slow installs:

DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

Fix 8: Download Update Manually

If a specific update keeps failing or downloading slowly:

Note the KB number from Update history
Go to catalog.update.microsoft.com
Download directly from Microsoft — bypasses Delivery Optimization

Fix 9: Check Disk Space

Updates need free space to download and extract. Windows needs at least 10-15 GB free.

Get-PSDrive C | Select-Object Used, Free,
  @{n='Free GB';e={[math]::Round($_.Free/1GB,1)}}

If low: Win + R → cleanmgr → Clean up system files → check Windows Update Cleanup.

Check Update Download Progress in Detail

# BITS transfer queue — shows active update downloads
Get-BitsTransfer | Select-Object DisplayName, BytesTransferred, BytesTotal,
  @{n='% Done';e={[math]::Round($_.BytesTransferred/$_.BytesTotal*100,1)}}

If BITS shows transfers with progress — updates are downloading, just slowly.

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Summary

Check Task Manager for network activity before assuming it's stuck. Quick fixes: restart Update service → clear SoftwareDistribution cache → disable peer delivery. If updates consistently fail: run DISM + SFC and download manually from Microsoft Update Catalog. Always ensure 15+ GB free on drive C before major updates.