In the post-tiles.php file of version 1.3.2 go to line 344 and modify it.
It should look like this:
query_posts($the_query);
Replace it with some form of the following:
query_posts($the_query . '&order=DESC' . '&orderby=post_date');
Use a combination of order and orderly. Order is either DESC or ASC. And orderby determines by what the ascending and descending uses such as ID, Date, Post Title etc. Here’s a link to the parameter options. https://codex.www.ads-software.com/Class_Reference/WP_Query#Order_.26_Orderby_Parameters
Also keep in mind that all modifications to any of the plugin files will be lost when you update to a newer version of the plugin.