the TOUCH Gen 2 file is a .upd file. All you have to do is download that file and drag-n-drop ( copy ) that file to a SSD card. Then insert the card and turn the unit ON. it will see the update ( .upd file ) and do it's thing.. do not power the unit off during the update process. The unit will reboot itself once it's completed. You can then remove the SSD card.
I always take the SSD card back to my computer and DELETE the file.
Normally, Lowrance packages the update as a ZIP file or Compressed... but in the case of the Gen 2 5.0 Touch update, they didn't ZIP it.. they simply have the file available to download and copy to the card. Hence, no need to un-zip or de-compress this update like previous HDS updates.
Hope this helps!