WordPress updates are straightforward – until they are not. If you have tried to update a plugin or theme and encountered this message:
An error occurred while updating [plugin name]: Download failed. Destination directory for file streaming does not exist or is not writable.
Your update did not complete, and your site is now running an outdated version of that plugin or theme. That matters for two reasons. First, outdated plugins are one of the most common entry points for security vulnerabilities. Second, the underlying cause of this error rarely resolves itself – it needs to be fixed before your next update attempt hits the same wall.
Here is what causes it and how to fix it.
What Is Actually Going Wrong
When WordPress runs an update, it downloads the new files to a temporary directory – typically wp-content/upgrade/ – before moving them into place. This error appears when WordPress cannot write to that directory, either because the directory does not exist, the file permissions are set incorrectly, or something on the server is blocking the write process.
The four most common causes are:
- The wp-content/upgrade/ folder is missing or has incorrect permissions
- File and folder permissions across wp-content/ are set too restrictively
- A caching tool like WP Rocket or Redis Object Cache is interfering with directory paths
- Server-level PHP limits or disk space constraints are blocking the download
Each has a straightforward fix. Work through them in order.
Fix 1 – Check the Upgrade Folder
The first place to look is the wp-content/upgrade/ folder. WordPress needs this directory to exist and be writable during updates.
Log in to your hosting control panel and open the File Manager. Navigate to public_html/wp-content/ and look for a folder named upgrade. If it is missing, create it. Once it exists – whether you just created it or it was already there – right-click the folder, open the permissions settings, and set it to 755. This gives WordPress the write access it needs without opening broader server permissions.
Fix 2 – Define a Custom Temporary Directory
If the upgrade folder fix does not resolve the issue, WordPress may be struggling to locate a reliable temporary directory on your server. You can define one manually in your configuration file.
In your wp-content/ directory, create a new folder named tmp. Then open wp-config.php from your site’s root directory and add the following line near the top, before the line that reads “That’s all, stop editing”:
define('WP_TEMP_DIR', ABSPATH . 'wp-content/tmp/');
Save the file and attempt the update again. This tells WordPress exactly where to write temporary files during the update process, bypassing any ambiguity in how your server handles directory paths.
Fix 3 – Correct File and Folder Permissions
Incorrect permissions across wp-content/ are a frequent culprit, particularly on servers that have been migrated or reconfigured since the site was originally built. The correct settings are straightforward: folders should be set to 755, files to 644.
In your File Manager, right-click the wp-content/, upgrade/, and tmp/ folders and verify each is set to 755. If any are set to 777 – a common shortcut that introduces security risks – correct those while you are in there.
Fix 4 – Clear Your Caches
Caching tools occasionally hold onto stale directory path references that interfere with the update process. If you are running WP Rocket, navigate to WP Rocket > Dashboard and clear the cache. If you have Redis Object Cache active, go to Tools > Redis and flush the cache from there.
This is a quick check that rules out a common variable before moving on to server-level diagnostics.
Fix 5 – Check PHP Limits and Disk Space
If the above fixes have not resolved the issue, the problem may be at the server level. Two things to check: PHP configuration limits and available disk space.
For PHP limits, the values that most commonly affect update processes are:
upload_max_filesize = 64M
post_max_size = 64M
memory_limit = 256M
max_execution_time = 300
These can typically be adjusted through your hosting control panel or by editing your php.ini file, depending on your hosting environment. If you are on a managed hosting plan, contact your host and ask them to confirm these values.
For disk space, check your hosting dashboard for current usage. An update that cannot complete because the server has run out of space will produce the same error – and it will keep producing it until the space issue is resolved.
When the Fix Is Not Straightforward
The steps above resolve this error in the majority of cases. If you have worked through all five and the problem persists, the issue is likely deeper – a server configuration conflict, a hosting environment restriction, or a permissions problem that extends beyond wp-content/. At that point, the fastest path to resolution is handing it to a team that works inside WordPress hosting environments every day.
Leaving the error unresolved is not a neutral position. An outdated plugin on a live site is a security risk, and the longer it sits, the wider the gap between your current version and the patched one.
The Bigger Picture: Proactive Maintenance Prevents This
This error is fixable. But the businesses that never see it in the first place are the ones running proactive WordPress maintenance – where updates are managed on a schedule, permissions and server configurations are reviewed regularly, and issues like this are caught and resolved before they block an update on a live site.
RubyWeb’s Monthly Care Plans cover exactly this. Regular plugin, theme, and core updates, security monitoring, uptime management, and a team that knows your site’s architecture and can act fast when something needs attention. If managing WordPress maintenance is taking time away from running your business, it is worth a conversation.
