If anybody needs other versions, I just pushed 2 newer ones. Here they are:
http://www.apkmirror.com/apk/samsung-electronics-co-ltd/samsung-account/.
Thank you so much!!!!!
This just happened to me:
I got my new beautiful Gear S2 in roségold, and I wanted to install content from the samsung marketplace. I was always informed that I have to login into my samsung account to do that, and I wondered why. I went to my Accounts, and saw that the Samsung Account wasn't there. Then I tried to add the Samsung account, but it flashed only for an instant and didn't open. To check if the whole account adding thingie is broken, I tried adding an amazon account, and that opened without a hitch.
OK, back to start. Reading on the net that people did a whole factory reset for this little file shocked me out of my socks. Fortunately I wasn't wearing any.
The Reactivation Lock was also set, but grayed out!
I know that every program is an apk, so I googled for "Samsung Account APK" and there was this entry!
It turned out that the Samsung account app wasn't showing on my phone!! I searched with ES Explorer for it, and there it was. But it was a very old version. So I downloaded the newest from the apkmirror.com, installed it and VOILA!! Everything was back to normal.
Thanks again.