Hello,
1) Go to Products > Product categories > edit product category and upload the product category thumbnail.
2) Go to Products > Brands > edit product brand and upload the brands’ thumbnails.
If you update XStore core plugin you will also need to update theme.
You have 42 days of the support period. You’ll be able to update support period from your ThemeForest account if you still need our support after 42 days.
Regards