I agree, the Onion is a currency of privacy purely to hold long term, the benefits that this cryptocurrency has will cause its price to skyrocket.

Did you update your C:\Users\USER_NAME\AppData\Roaming\DeepOnion\DeepOnion.conf with the latest nodes (click here)?
Maybe your router or your firewall is blocking the ports that are used by the DeepOnion wallet.
Maybe your connection to Tor is blocked and you need to use OBFS4 or MEEK, but this is NOT common.

Start with the DeepOnion.conf and update the nodes from the link I provided.
Work your way up from there. Some members can help you to forward the port used by DeepOnion Wallet because I don't remember the number.

There is only one post at the community mentioning "onion hostname" and it seems to be related to port forwarding.
You can join us at the community, I'm sure more members will be willing to help you there.
If nothing worked, you can create a Support Ticket at the community forum.

Did you get some sort of error code/message? Did it install, but then crash after a couple of minutes? What OS are you using?

We can only help if you provide us with some more information

DeepOnion is getting bigger and stronger everyday. The performance of this coin is exceptional as always.