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Solution:
To upgrade the Joomla 3 component and plugin to versions 4 and 5, follow these steps:
1. Backup your website: Before making any changes, it is important to back up your website to avoid any data loss in case something goes wrong during the upgrade process.
2. Check compatibility: Check if the custom component and plugin are compatible with Joomla 4 and Joomla 5. If not, make necessary modifications or reach out to the developer for an updated version.
3. Update to Joomla 3.10: Joomla 3.10 is the transitional version that will help in upgrading from Joomla 3.x to Joomla 4. It is highly recommended to update to this version before starting the upgrade process.
4. Upgrade to Joomla 4: Using the Joomla! web installer, you can upgrade your website to Joomla 4. The process may take some time depending on the size of your website and the number of extensions.
5. Install Joomla 4 compatible library: As mentioned in the project description, the custom component uses phpexcel library. However, Joomla 4 and 5 use phpspreadsheet library. So, you need to install the latest version of phpspreadsheet library on your website.
6. Update the component and plugin files: Replace all the old component and plugin files with the updated versions that are compatible with Joomla 4 and 5. You can find these files in the respective extensions’ download page on Joomla! Extensions Directory (JED).
7. Test and make necessary modifications: After completing the upgrade process, test your website to see if all the functionalities are working properly. If there are any issues, make necessary modifications or reach out to the developer for assistance.
8. Repeat the above steps for Joomla 5: Once you have upgraded to Joomla 4 and everything is working as expected, you can repeat the same process to upgrade to Joomla 5.
Note: Always make sure to check for any compatibility issues before upgrading to a newer version of Joomla. It is also recommended to have a test environment to perform the upgrade process first before implementing it on your live website.
In conclusion, upgrading the Joomla 3 component and plugin to versions 4 and 5 may require some modifications and specific steps depending on the extension used. However, by following these steps, you should be able to successfully upgrade your website to the latest versions of Joomla and ensure smooth functionality of your custom component.
Best regards,
Giáp Văn Hưng