HELP Sprite Packer SEVERE issues on 4.6.8p2 and 5.2.1p2

Hello,
I’ve completed my game and ready to publish it. My publishers (big publishers) are waiting the build to publish the game worldwide but i can’t finalize the build due to sprite packer crash.

I have over 8000 sprites in my project, full rect, divided in almost 50 tags and imported as advanced sprite and configured to obtain compressed atlas: DXT5 for PC/MAC and PVRTC RGBA 4 bits best for both iOS and Android, no mipmap, 0 extrude.

The project was made in unity 4.6.x, First i tried to pack sprites on a macbook pro, editor crashed.
Then i ported all the 16Gbytes project on PC (32 Gbytes ram) and also crashed.
In the editor.log it says to have a memory problem in Texture2D.cpp at line 411
I tried all woraround found in the forum, such as deleting Library folder, atlascache folder. But always same problems.

I’ve also submitted a couple of crash reports (but didn’t upload the project because of its size)

So i dediced to migrate the project to unity 5.2.1p2, if i click to pack inside editor unity crashes also. Sometims it does build, but it did not pack all the tags. In sprite packer i can only see half of the tags i created.
Looking at editor.log i’ve also seen that it shows all tags being processed but it also says:

Cannot load Atlas During Build/Enter Game. Missing File ?

UnityEditor.Sprites.Packer:RebuildAtlasCacheIfNeeded(BuildTarget, Boolean, Execution)
UnityEditor.Sprites.Packer:RebuildAtlasCacheIfNeeded(BuildTarget, Boolean) (at C:\buildslave\unity\build\artifacts\generated\common\editor\SpritePackerBindings.gen.cs:74)
UnityEditor.Sprites.PackerWindow:smile:oToolbarGUI() (at C:\buildslave\unity\build\Editor\Mono\Sprites\SpritePackerWindow.cs:133)
UnityEditor.Sprites.PackerWindow:OnGUI() (at C:\buildslave\unity\build\Editor\Mono\Sprites\SpritePackerWindow.cs:264)
System.Reflection.MonoMethod:InternalInvoke(Object, Object[ ], Exception&)
System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object[ ], CultureInfo) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
System.Reflection.MethodBase:Invoke(Object, Object[ ]) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView:Invoke(String, Object) (at C:\buildslave\unity\build\Editor\Mono\HostView.cs:187)
UnityEditor.HostView:Invoke(String) (at C:\buildslave\unity\build\Editor\Mono\HostView.cs:180)
UnityEditor.DockArea:OnGUI() (at C:\buildslave\unity\build\Editor\Mono\GUI\DockArea.cs:336)

[C:/buildslave/unity/build/Runtime/Graphics/SpriteFrame.cpp line 442]
(Filename: /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs Line: 222)

Please if anyone could help.

Bumping this, any chance u posted bug report?

Bug Reported Case: 732611 and 730905

I am still trying to find a workaround

I have got the same issue, Unity crashes all the time.