I have thoroughly tested your site on my local PC. I successfully installed Joomla 4.4.10, and I noticed that the VirtueMart, K2 component, and vmLoaderPluginUpdate plugin are very old versions. These older versions are not compatible with Joomla 4 and cause issues.
Therefore, please follow these steps on your staging site:
- Upload the stable Joomla 4 versions of these extensions first:
• VirtueMart
• K2 component
• vmLoaderPluginUpdate plugin
- For SP Page Builder, do not use the latest version; instead, use a version compatible with Joomla 4, such as SP Page Builder v4.0.11 or 5.0.0.
- After uploading the stable versions, install Joomla using the upload and update options. You will see stable versions available for download there.
We will continue to provide support for these third-party products. You may also contact this template owner support forum, they may can help or have this template for Joomla 4 compatible.
Thank you for your understanding.