Thank you all for the reply!
The main problem is because the script update took so long working (“Started Thu Mar 22 18:04:19 UTC 2018 - Finished Thu Mar 22 20:02:13 UTC 201”, that changing to RO was inevitable.
I found 2 problems:
( please notice that i already reinstalled the emonSD latest image again, so all the logs went lost)
1- I notice that (on raspberry pi 3 B), selecting emonpi update, it doesn’t really update emonpi ( at least don’t change the version). (to make it work it i had to do this: emonPi update Emoncms V9.8.28)
2-when using the script, having a wired connection (i have 100MB/s connection in my home) it takes “hours” (4kb/s average) to download the packages, probably because raspberry pi not having the latest software update.
3- after a new reinstall of the image and a new try on the script, at first script try, didn’t work well, i had to try it again as John advised and then it worked well, all after update raspberry pi with the latest updates.
Now it is working well but installing some nodes by terminal, some of them don’t appear on node-red, even if on pallete manager says installed.