Symptoms
When editing the store, such as adding a Kit Product, you encounter an error with the message: Could not find a part of the path ...\wwwroot\images\Product\micro\some.jpg
Cause
Software editions previous to ML8 did not have micro images and after upgrading the site to a newer version, this folder needs to be added.
Solution
Add the folder to your store. If you are unsure how to do this, consult your server host to create it for you.