No, this is for the older version of 2.05.
As far as I know, the 2.6 LTS version is only available to customers of the some kind of service of the Limesurvey GmbH, who is taking care of this older branch of LS. If you have a subscription to the comfort update for example, you should be able to download this. Go to your profile and at the bottom of the menu to the left you will find "premium downloads". If you are not a subscriber of the comfort update, then you won't have access to download the 2.6 LTS version, I think.
There is another version of the 2.0x branch by the Limesurvey developer snoulle, who provides security fixes to the older branch as well. I don't have a link to this one, would need to search for it. I think the user Ben has posted a link to it recently. I guess it is only available via github:
github.com/Shnoulle