Hi,
Each time you update Hikashop, you remove modification I made via your FTP.
Let's make another try : install Hikashop again, and replace those files :
administrator/components/com_hikashop/helpers/import.php by this one :
administrator/components/com_hikashop/helpers/importvm.php by this one :
administrator/components/com_hikashop/controllers/import.php by this one :
administrator/components/com_hikashop/views/import/view.html.php by this one :
Then, run the import again from this clean installation.
I hope this time, categories & images will be imported correctly. If not, take another screen, errors messages are now more specific.
Sorry for making you doing so many tries.