The setup finally somehow works:
I followed the guide at
It starts donwloading something but not pharo
I tried to do at seperate steps:
Only the image
* wget -O-
get.pharo.org/70 | bash
works, but is the wrong VM I guess, I can not open the image
* wget -O-
get.pharo.org/vm70 | bash
works, seems to load the right vm
* ./pharo-ui Pharo.image
Starts the vm but complains about :
"Pharo cannot write to the changes file named u:\tmp\pharo\Pharo.changes."
I am sure the file is writable.