How to Install OpenCart MultiVendor Extension on Version 4

By Admin | Oct 03, 2022

Applicable for All OpenCart 4.x.x.x Versions

Installing extensions in OpenCart 4 is slightly different from OpenCart 3. This guide uses the Multi-Vendor extension as an example, but the process applies to all OpenCart 4 extensions.

The steps apply to versions 4.0.0.0, 4.0.1.0, and 4.0.1.1.

If installed incorrectly, uninstall it using the Extension 4.x Uninstall Guide . Uninstalling also removes extension-related data.

Steps to Install OpenCart Modules on Version 4.x

IMPORTANT: Rename the File Before Uploading

If your file is named like purpletree_multivendor.5.ocmod, it will NOT work.

You must rename it to: purpletree_multivendor.ocmod

Files with numbers (e.g., .5, .4) in the name will cause issues.

Remove the number to make it: purpletree_multivendor.ocmod

Step 1: Extensions > Installer

Go to Admin > Extensions > Installer and upload the renamed extension file.

Wait for the message: "Success: Extension has been uploaded."

Step 2: Install the Uploaded Extension

Scroll down to "Installed Extensions" and click the green plus (+) icon to install.

Please wait 3–6 minutes for the progress bar to complete. Do not interrupt.

Success message: "Success: You have modified extensions."

Step 3: Activate the Module

Go to Extensions > Extensions, select "Module", find Multi-Vendor, and click install.

Step 4: Set Permissions

Go to System > Users > User Group, edit the "Administrator" group.

Enable both Access and Modify permissions for the extension, then click "Save".

Step 5: License Activation

Go to Extensions > Extensions > Module, select "Multi Vendor Settings".

Click "Edit", enable the module, enter your license key, and click "Save".

Important Server Settings

upload_max_filesize = 20M
post_max_size = 20M
max_execution_time = 120

Required Permissions (Screenshots)

Ensure the following permissions are granted:

After completing all steps, your extension will be successfully installed on OpenCart version 4.x.