Magento 1

To avoid problems after installing or updating an extension please follow these steps in the correct order:

  1. Flush all Magento-caches
    In "System -> Cache Management"
  2. Reindex all tables
    In "System -> Index Management"
  3. Disable the Magento Compiler
    In "System -> Tools -> Compilation", see also http://kb.magenting.com/content/24/81/en/disable-magento-compiler.html
  4. Log out from admin panel, then log in again
    This prevents or resolves 404 errors in the Magento backend.

 

Re-installation
If the extension has been uninstalled and is now being re-installed, please check if the database has been cleaned up. In the table core_resource the entry [extensionname]_setup must be removed. Otherwise the install-scripts won't be started again.


Magento 2

Modules for Magento 2 will usually have a README file in the module package. Follow the instructions from that README file to install the module.


Important

  • Make sure to follow all steps in the correct order.
  • Do not skip any step or CLI command!
  • For a Composer installation, all path names must be 100% correct in the file composer.json
  • When installing from a ZIP / TGZ package, the path to the directory which contains the package must usually be given, not the path to the package itself.