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How can I find the Cat_ID to show posts in a specific category in ver 1.2.1?

You can easily find it in "Dashboard\Posts\Categories" area, move the mouse over the category name and you will see something like "categories.php?action=edit&cat_ID=180", that's the point. Another way is to install a plug-in can show all the ID number (I am sure it exists)

If my themes does not support widget, what can I do?

1. The simpliest, widgetize your themes, u can search how to do it on the internet.
2. Download the ver 1.2.2 and use the function : ucp_show(’the title here - it should be blank’, ‘the id of the specific cat if u want or leave it blank’, ‘number of posts to show’, ‘if no post’, ‘time style’, ‘if you want to show time’, ‘if u want to show cat’, ‘if u want to show excerp’, ‘if u want to switch to’ )

For example: < ?php ucp_show('','','3','No post','d.m.Y','true', 'true', 'false','false'); ?>