I bought some Espers and transferred them to my wallet. It synced and the correct amount is showing. Now, how do I store it offline? I copied "Espers-qt.exe" on USB stick and tried it on another computer to see if it's working, and it's showing 0 Espers balance. Does it have to sync again?
where did you buy it? Yobit has old ESP1 which now is worthless
the ESP over at coinexchange is that ok? I am just abit confused, ESP, ESP1, ESP2

coinexchange and novaexchange you can buy.
the confusion I think many people are having are the names ESP and ESP2, at novaexchange its called ESP2 but on coinexchange its called ESP.
from what i understand both novaexchange and coinexchange are EPS2 coins although coinexchange calls it EPS and not EPS2.
am i correct?
Correct. Both, nova and coinexchange are ok.
Maybe have a look at the ANN?
At both exchanges you can buy ESP.
But if you like to confuse more, you can call them EPS and EPS2 
see how I am confused. ESP