Hi miningpoolhub
I am reading the dev have done a fork of ZCL and ZEN

https://bittrex.zendesk.com/hc/en-us/articles/115000201171-Support-for-the-ZEN-Hardfork

and the wallet and software need be updated
https://blog.zensystem.io/

That why Bittrex close down zcl/zen wallet