Hi Seven,
Generally if the number of devices managed by NSM are less than 25 then it is base license used on that server. When you need to manage more than 25 device you need to purchase additional license.
on your NSM CLI you can naviagate to /var/netscreen/GuiSvr/License and check if you see license.txt there, If yesmove it to your PC using WINSCP. If no you can assume that it is the base license and proceed with the upgrade.
You need to use the below mentioned file for the linux server:
| Linux Server | MD5 SHA1 | 2010.3s1 | zip | 1,176,388,021 | 01 Dec 2011 |
| Linux System Update utilities | MD5 SHA1 | 2010.3s1 | zip | 77,973,357 | 01 Dec 2011 |
The files you have mentioned in question#4 are for hardware appliance, for linux server you need download the same above file from 2012.2 section.
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Regards,
RIshi