Migrating VM1 to Hikashop - images not vissible

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 1.5.26
-- PHP version -- : 5.3.29
-- Browser(s) name and version -- : Firefox 35.0.1
-- Error-message(debug-mod must be tuned on) -- : no

I am working on a website with Joomla 1.5 and VM 1.1.9 that will be transferred to Joomla 3.3 and Hikashop.
First I have installed Hikashop on J1.5 and import VM products in Hikashop.
Problem: there are no images visible.

When I make a new product with image, then an image is vissible. The image in Hikashop is put in domainname.com/images/com_hikashop/upload/

So I did the following:
The VM images from domainname.com/components/com_virtuemart/shop_image/product/
are copied and paste in domainname.com/images/com_hikashop/upload/
But that does not solve the problem to show all images.

How can I show all images in Hikashop?

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I did not look carefully, the images are vissible now. Copying all images worked well