I just downloaded the beta 68 after some back and force between V7 and V6 now the V7 does not lunch and gives this error. I tried deleting and re extracting it and it did not help!
There's a bug in the current beta that can cause this error when certain alerts pop up before Zotero has fully started. Hard to say what the underlying error is here, but this should be fixed in the next Zotero 7 beta next week.
Upgrade Storage
this.init@chrome://zotero/content/xpcom/zotero.js:238:5
ZoteroService@jar:file:///C:/Users/user/Downloads/Zotero-7.0.0-beta.68+c31a40c74_win-x64/app/omni.ja!/components/zotero-service.js:351:23
createInstance@resource://gre/modules/ComponentUtils.jsm:90:19
@chrome://zotero/content/include.js:5:3
@chrome://global/content/commonDialog.xhtml:34:25
openWindowPrompt@resource://gre/modules/Prompter.jsm:1226:17
openPrompt@resource://gre/modules/Prompter.jsm:1067:12
openPromptSync@resource://gre/modules/Prompter.jsm:1046:10
confirmEx@resource://gre/modules/Prompter.jsm:1465:10
confirmEx@resource://gre/modules/Prompter.jsm:305:14
There's a bug in the current beta that can cause this error when certain alerts pop up before Zotero has fully started. Hard to say what the underlying error is here, but this should be fixed in the next Zotero 7 beta next week.