Highend demo, failed to import

Hi there

I tried to import the highend main demo but could not do it via the one-click import due to the maximum execution and maximum input time difference.

Please resolve these issues with your server configuration before importing any demo template:

Maximum Execution Time (max_execution_time) : 120 seconds. Recommended max_execution_time should be at least 400 Seconds.
Maximum Input Time (max_input_time) : 120 seconds. max_input_time should be at least 300 Seconds.

I then tried to do manual demo import, following the instructions and got the demo file from here: https://hb-themes.com/forum/all/topic/manual-demo-import/

but after clicking submit at the importer, I got an error ‘Gateway Time-Out’. If I go back to the previous page (back function through browsser), this error appears:

Sorry, there has been an error.
File is empty. Please upload something more substantial. This error could also be caused by uploads being disabled in your php.ini or by post_max_size being defined as smaller than upload_max_filesize in php.ini.

Can someone please assist? thanks