Note: If you need a login for ZPE's Sharefile service, please contact ZPE Support.  Be sure to follow the recommended upgrade paths: Nodegrid OS Upgrade Path

In a browser open https://zpe.sharefile.com/

Login in

Navigate to the "Shared Folders" directory

Open "Released Software Download"

Click on version you are upgrading to

Read release note

Select the iso and the iso.md5 files

Click download

After the download is complete, run a checksum on the iso file to confirm that it downloaded properly.  Then use these steps to upgrade: How Do I Upgrade the Software of My Nodegrid?