[pi-err]

If you haven't updated yet, why would you need the Sierra installer? Nobody managing multiple machines would use a 1.0 anyway.

[bdcravens]

Depending on how old the OSX currently running is, some features (especially integration into other Apple devices, like unlock with watch or seamless switching to AirPods) are unavailable, but would be available in Sierra.

[pilsetnieks]

I think he needs to update something even older.

[egb]

Correct - snow leopard to sierra would be the goal.

[gm-conspiracy]

10.6.8 seemed to be the most stable for me.