#38 Error when opening my pre-3.0 ATMA stashes

[Atrocious Nightmare]

I apologize if this is not a bug and just me misunderstanding something.
I do not own the expansion yet.
I downloaded the new GoMule 5.0 version, selected the "Expansion" variant, opened my 2.x expansion characters in-game and converted them to 3.x. Then opened them in GoMule and they seem to work well. Same thing for the shared stash.
But I can't seem to get how to convert/use my ATMA stashes.
This is an example Error I get when I try to open one:

Error

Checksum Incorrect! Expected: 1102940 Found: 3986429225
    at gomule.d2x.D2StashReader.checkChecksum(D2StashReader.java:65)
    at gomule.d2x.D2StashReader.checkHeaderAndLoadItems(D2StashReader.java:41)
    at gomule.d2x.D2StashReader.readStash(D2StashReader.java:32)
    at gomule.d2x.D2StashReader.readStash(D2StashReader.java:18)
    at gomule.gui.D2FileManager.addItemList(D2FileManager.java:1825)
    at gomule.gui.D2ViewStash.connect(D2ViewStash.java:356)
    at gomule.gui.D2ViewStash.<init>(D2ViewStash.java:288)
    at gomule.gui.D2FileManager.openStash(D2FileManager.java:1725)
    at gomule.gui.D2ViewProject$CharTreeNode.view(D2ViewProject.java:402)
    at gomule.gui.D2ViewProject$3.mouseReleased(D2ViewProject.java:126)
    at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$500(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

Also, I saw that there's the option to switch between game versions, it's greyed out for me. How come?

Thank you in advance and thank you so much for updating the software!

[Silospen]

Thanks for using GoMule! unfortunately i dont add support for time traveling between versions because I don't have confidence that i understand the differences between file versions and don't want to corrupt your characters or items. That means the only option is to load up a mule char with the previous version of gomule, add items to it, open it in the game to upgrade and then open in the current version of gomule and it should be up to date.

And game version switching I haven't implemented yet 😊

[Atrocious Nightmare]

Thank you so much for taking the time to explain this!
I've just finished muling everything and it went smoothly. The Mule.d2s you uploaded came in handy!