Sorry for the delay in replying – this week I have been busy due to traveling. Pagination function for category posts blog shortcode is not currently supported. Can you check if you can use the regular WP category pages which support pagination by default –
Sorry – I had it ready this week but could not send it to you. Pls see the attached files in my next message – incorporate them into your site to see the pagination on the shortcodes. You can view the changes by using a tool like DiffMerge or the WinMerge.
I am not sure this needs to be part of the regular theme. Will preserve it though in case someone needs it. The loop-pagination.php change will probably go into the regular build for next update since I see no issues with it.