ZClient issue-can't enter account info, won't open now?

I went through the guide, but when it came time to open ZClient, it wouldn't let me enter my credentials, citing an update, then closed. Now I can't get it to open again, it will run in the background but not give me a spot to fix the mail credentials.

I have run both as admin and regularly.
I have rebooted the computer. 
I have disabled Window's Defender.
I did give it permission through the firewall. 

Any other ideas? I can't figure out what might be blocking it. I have Windows 10 OS.

I went to try to re-install it, but it doesn't show up on my program lists anywhere. Even Wise Uninstaller can't find it. Hmmm.

Same, just reinstalling everything over and oveeeer.

Open the downloaded Folder ZClient.
Remove everything inside it except ZClient.exe.
Now run ZClient.exe again.
You should now be able to enter your own details.

I also discovered if you go into ZData_Settings.zlo with notepad, you can manually enter the info. So now the thing comes up. Though it says mail not found