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I have been using TT since the early 90's and never experienced such poor customer support as with this issue.  I too loaded TT21 on my Mac with macOS Monterey Ver 12.2.1 and all latest updates.  After initial installation, it worked fine, only showing the "Hit a Snag" error window on boot.  Now, I remember this occurred with TT20 last year and if you don't hit "Send to TurboTax" everything is OK.  But this year, I figured TurboTax needed to know about the issue, so I pressed the send button.  Big mistake, as now I can't get TT21 to start anymore without crashing when doing the update process.  I have spent 4+ hours with 6 different Intuit service techs at all levels, including the remote desktop session with the last tech and I showed him everything I had found.  Still no luck after multiple uninstalls (using the very old instructions, as only 1 file really exists per the list) and even installing a completely new copy provided by one of the tech supports.  I have found exactly what is the crash, but the techs don't seem to care about this.  So I am putting a log of it here:

2022-02-19 15:27:58.111 TurboTax 2021[4389:50464] ESD:Validating xml Signature...
2022-02-19 15:27:58.112 TurboTax 2021[4389:50464] ESD:Validating xml Signature...
2022-02-19 15:27:58.114 TurboTax 2021[4389:50464] ESD:Validating xml Signature...
2022-02-19 15:27:58.115 TurboTax 2021[4389:50464] ESD:Validating xml Signature...
2022-02-19 15:27:58.116 TurboTax 2021[4389:50464] ESD:Validating xml Signature...
2022-02-19 15:27:58.120 TurboTax 2021[4389:50464] ESD:Validating xml Signature...
2022-02-19 15:27:58.122 TurboTax 2021[4389:50464] ESD:Validating xml Signature...
2022-02-19 15:27:58.123 TurboTax 2021[4389:50464] ESD:Validating xml Signature...
2022-02-19 15:27:58.161 TurboTax 2021[4389:50464] EngineUpdate - FOUND CRITICAL PACKAGE with version [phone number removed] in upgrade path from current version [phone number removed]
2022-02-19 15:27:58.162 TurboTax 2021[4389:50464] EngineUpdate - 17 packages info recieved from ESD
2022-02-19 15:27:58.162 TurboTax 2021[4389:50464] EngineUpdate - Package with version no. [phone number removed] passed to updater for download
2022-02-19 15:27:58.250 TurboTax 2021[4389:50464] EngineUpdate - Callback bestValidUpdateInAppcast:
2022-02-19 15:27:58.250 TurboTax 2021[4389:50464] EngineUpdate - ESD package version [phone number removed] is higher than installed product version [phone number removed] so let us trigger package download
2022-02-19 15:27:58.251 TurboTax 2021[4389:50464] EngineUpdate - Build no. in host Info.plist is 2021.r17.078, and ESD Package version no. is [phone number removed]
2022-02-19 15:27:58.251 TurboTax 2021[4389:50464] EngineUpdate - Callback updater:didFindValidUpdate: with item [phone number removed]
[2022-02-19 15:27:57.605222] (0x000000010c1f7600) [LOG_CLOUD] [/Users/ctobuilduser/workspace/cicd-ci-ty20/CG/TTMacBuild/dev2020/Src/mta/feature/NativeAppShell/Common/LoggingHandler.mm(35) @ function : +[LoggingHandler SendLoggingEvent::]] { "tag" :"MachineIDGeneration","levelName" :"log","message" :"decryptDataLicensing : decrpytData returned nil"}

2022-02-19 15:27:58.494 TurboTax 2021[4389:50464] Terminate called after uncaught c++ exception:
0 TurboTax 2021 [phone number removed]c2d44b PrintStackAndTerminateOnUncaughtCPPException + 59
1 KSCrash [phone number removed]44ce10 _ZL21CPPExceptionTerminatev + 86
2 libc++abi.dylib 0x00007ff81ebd74d7 _ZSt11__terminatePFvvE + 8
3 libc++abi.dylib 0x00007ff81ebd7488 _ZSt9terminatev + 56
4 libdispatch.dylib 0x00007ff81ea64cdd _dispatch_client_callout + 28
5 libdispatch.dylib 0x00007ff81ea715d8 _dispatch_main_queue_callback_4CF + 951
6 CoreFoundation 0x00007ff81ed20689 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
7 CoreFoundation 0x00007ff81ece175e __CFRunLoopRun + 2752
8 CoreFoundation 0x00007ff81ece05dd CFRunLoopRunSpecific + 563
9 HIToolbox 0x00007ff82791d4f1 RunCurrentEventLoopInMode + 292
10 HIToolbox 0x00007ff82791d247 ReceiveNextEventCommon + 587
11 HIToolbox 0x00007ff82791cfe5 _BlockUntilNextEventMatchingListInModeWithFilter + 70
12 AppKit 0x00007ff82170fd88 _DPSNextEvent + 886
13 AppKit 0x00007ff82170e3f4 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1411
14 AppKit 0x00007ff821700919 -[NSApplication run] + 586
15 AppKit 0x00007ff8216d47b7 NSApplicationMain + 816
16 TurboTax 2021 [phone number removed]721b37 main + 39
17 dyld 0x000000010c17c4fe start + 462

Can someone please help me?  I need to file my taxes and time is running out.