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

@Chakall there is no update yet when there is a update it will be shared first here, 
Gingko has the link from us,

i think the one who cant log in becourse its loading, did you all check your virus killer?
i think it hold a cbv

Hey there!  When I first downloaded this it worked great, but then recently it started getting stuck on the Loading World screen.  My antivirus is turned off, and I'm even running the program as administrator.  Nothing I've tried seems to work.  Any other fixes I should know about?  Thank you so much!

@helbelle666 i dont know why people has that problem i checked many times and it works fine here
try too clear cookies, and cache, try a clean install,  look in your preference, secondlife saved also cookies

Sadly this still has not really been truthfully updated  and it constantly crashes its now 07/15/21 nothing has been "publically updated nor fixed no new link's much even posted including the crappy work around stuff required like the so called fix to "meshes" because the default "firestormos/hydrastorm still will NOT export mesh or rigged mesh like it should via xxml and with out development work/and features  tis sight is still begging dor "sponsers" without doing work ..nothing personal but im personally loath to pay good money ive worked damn hard for to literally get nothing for it ..hell hale he links on this for alleged files for meshes are broken and not being removed /upkept even when the ones supposedly incharge are "pinged" to do so .. i dont mean dis respect but if you expect to get "support" you really need to funish something substansive to demonstrate its worth it because rimmping mesh may be all well and good but the amount of "work to work theses bullshit work arounds if they work you may as well put the time into creating stuff your self just being danged honest :/

@Prometheus believe it or not but this is still the latest Hydrastorm, there is no update yet, 
and Mesh Helper works with xml files to make it rigged, its always cheaper to buy but thats everyone 
they own choise

Just a heads up. The current version of hydrastorm is no longer opening. it crashes on load.

Currently getting a crash upon loading

HELLO friends, same here. does not upload, gets immediatly crash.

i dont have any problem yet still can use it

if you install now the newest firestorm,
it seems that hydrastorm not work anymore but i am still on the old firestorm so can play with it

best is what you can try, to unistall hydrastorm, and install it again but change the name, to hydra or so, becourse they have the same name (Firestorm)