I did the update with recomended version 2:
copy database (table jos_jshopping_*) from site 1 to site 2
copy folder \components\com_jshopping\files from site 1 to site 2
table jos_jshopping_products. rename field "product_name_image" to "image"
all went but images.
If there are more images assigned to a product, I cannot see the main (default) image, but all other product images.
Where is the relation to this lost images, which sql table?