To use Crane theme you should ensure your website is operating on WordPress 5.0 or greater version.
Minimum server requirements
For correct work of Crane theme, hosting must meet the following requirements:
Minimum PHP limit settings
Many problems you may face, such as failure of data update, failure of data import, “white screen”, “empty content page”, etc. arise due to low limits in PHP configuration. We recommend to set the following minimum limits for php.ini:
Additionally, if your site is on VPS or dedicated server
Please make sure that following PHP modules are installed and active: