Hi Maria,
I am sorry for the delay of this reply. May I know what actually you want to achieve in the file EasyBlogLatest.php, imagecat.php, and featured.php?
If you want to customize the default_item.php you cannot directly pointed to it. Here is the steps to use alternative layout in mod_easybloglatestblogs:
[For example for feature.php]
1. Copy the default.php in the folder modules/mod_easybloglatestblog/tmpl/default
2. Paste it and rename it to featured.php
3. Edit the feature.php LINE 34 replace the default_item to featured_item
4. Copy default_item.php
5. Paste it and rename it as featured_item.php
6. You can edit the final view of the module in the featured_item.php
7. On backend module choose featured for the alternative layout
The reason you cannot directly change the default_item.php to featured.php because in mod_easybloglatestblogs, it will called the default.php first then default_item.php
You have to do same with another imagecat.php etc.