It is confusing but on the front page OP download Windows client - It is actually a launcher, not the wallet itself, so be ok with it saying Espers-v0.8.4.2-Patch-4

Extract the launcher and run, you will see small window - click update

Let it do its stuff then run launcher again, look down the bottom of the window and you will see version 0.8.4.2.5

Espers-qt.exe is in ......... AppData\Roaming\CryptoCoderz\ESP-Client or whatever custom directory you gave.

Wasn't this whole launcher thing supposed to make things simpler? Apparently I'm not the only one who finds it more of a hassle.
When it comes to simplicity, nothing beats a plain old zip file with the executable and whatever libraries it depends on. I wish that was still available