You will need to download a new depot to get EG 8.1 (which was released yesterday (6/18)!). Then you can use the standalone EG installer or the traditional SAS Deployment Wizard to install it. EG 7.1x versions will not notify you or support updating to 8.1 via Check for Updates, since 8.1 is a major new release.
Details:
This was an intentional decision because the project format has been versioned (as we now typically do at major release boundaries). Thus, once a project has been saved in EG 8.x, it is no longer backwards compatible with 7.1x versions of EG. For this reason, if you share EG projects, we recommend coordinating upgrading with your colleagues, so you use the same EG version.
Note: Since EG 8.1 is a major version and not an update, EG 8.1 can coexist (be installed side-by-side) with earlier EG versions.
Note2: Future 8.x releases will be able to be installed via Check for Updates from earlier 8.x versions, since they will be updates (minor releases) in the 8.x family.
Casey
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