We apologize for the inconvenience.
Based on the error you shared, the issue is not related to SP Page Builder or the Kreativa template. The 405 (Method Not Allowed) response is being generated by the server, which indicates that the server configuration is blocking the HTTP DELETE method required to remove files.
We also tested the behavior with Joomla's native Media Manager, and the image deletion fails there as well. This confirms that the issue is not specific to SP Page Builder's media manager.
Since uploading files works correctly but deleting them fails with a 405 response, we recommend contacting your hosting provider and asking them to check the server/IIS configuration, particularly whether the DELETE HTTP verb is allowed and whether any server-level security rules, request filtering, WebDAV, or WAF configuration is blocking DELETE requests.
Please ask your hosting provider to check their server logs for the corresponding 405 error as well. Once the server allows the DELETE method, the media deletion should work normally in both Joomla's core Media Manager and SP Page Builder.
Thank you for your understanding.