Switching Main Blog Image

Hi,
We have set up a new website and have been transferring the EasyBlog instance over along with some of the old blog posts, however we have come across an issue with the main image being displayed.

We have copied across the whole /images/easyblog_images/ folder from the old server to the new, however the main blog images are still not displaying at all (currently shows the holding image).
Looking at the source code I believe the issue comes from the Clarion template attempting to display the ‘large’ version of the image but it does not exist on the server.

For example one blog post is trying to use the image /images/easyblog_images/63/b2ap3_large_falloftheberlinwall.jpg
However the only versions which exist for this image is:
b2ap3_icon_falloftheberlinwall.jpg
b2ap3_thumbnail_falloftheberlinwall.jpg
falloftheberlinwall.jpg

It seems the original EasyBlog setup did not create the ‘large’ version of the image and therefore it is not available on the server and its not being picked up by the new layout.

Is there a way to generate the 'large' version for all the blog posts in one go?
If not, is there a way to have EasyBlog use the original image for the header area of the post, as that still exists on the server?

Thanks