The latest HydraStorm CopyBot Viewer 6.4.23.64823 (2021)
It works fine, it still has some bugs but you can use it.

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there is a discussion about this viewer, when you want to say something about it then move to there

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if you gonna say that here i will split your post

i dont have problems with crashes canncann, maybe you try to do more things at the same time

Mine also isn't working. It stops at loading world.

Anytime I save multiple accounts on hydrastorm/firestorm and try to login on hydrastorm again I get this message

" We were unable to decode the file storing your saved login credentials. At this point saving or deleting credentials will erase all those that were previously stored.
This may happen when you change network setup. Restarting the viewer with previous network configuration may help recovering your saved login credentials."

And all my saved login credentials are deleted. Any fix for this?

I'm getting the same error message: "We were unable to decode the file storing your saved login credentials..." when I am logging into Hydrastorm.

It started happening after I installed an updated Firestorm, specifying that I wanted to use Firestorm for multiple worlds (not just SL).  Now, in the list of usernames shown by both Firestorm and Hydrastorm, I'm seeing my alts listed as "[username]  @ Second Life".

In my case, what causes the message ("We were unable to decode the file storing your saved login credentials...") to appear when I'm starting Hydrastorm is that I have run Firestorm and am now switching back to Hydrastorm.  If I am running Hydrastorm only, I never see the message.

The only fix I have found is to restore my saved Hydrastorm settings.  At the Hydrastorm login page, click menu options Viewer - Preferences in the upper left corner.  Then in the Preferences window click 'Backup' on the left, then click 'Restore settings'.  Hydrastorm then requires a restart, but all my login credentials are restored.  Of course, this works only if you have saved your Hydrastorm settings.

This version have issue, daily i crashe 1-3 times when i right click on object and i didn't had those issues with older version. Thank you anyway for update :)

@TiaFe you have this problem becouse Linden lab change the cache,

@nyks001 we know that this viewer as a couple bugs but i can work with it and dont have 
the problem that i crash 1-3 times, the only thing when i crash sometimes, i want more things on the same time
no any viewer can handle that

anyone else having an issue logging in today with all accounts?

@markcyst i didnt log in with Hydrastorm today i dont know,
and with the normal viewer there was no any problem

anyone else having an issue logging in today with all accounts?

Yes, I'm having problems with the last version of Hydra, it's been days, it doesn't finish loading, the bar arrives at the end and crashes when the avatar should appear.
The problem is that Ginkgo no longer releases HydraStorm updates.