I'm running Windows 7 x64 in a virtual machine on a MacBook Pro using VMWare Fusion. I have been having many difficulties getting SourceTree to run.
First I had many update failures. Tried all of the recommended solutions on the forums here, uninstalled, updated .Net Framework version to the latest, updated Git to the latest, removed Atlassian directories, SourceTree directories, ran CCleaner. Made sure the Unused dictionary tag was in the user.config file per some postings from 2017.
Finally got it to install, although the installer said it failed I have the SourceTree.exe in the C:\Users\user\AppData\Local\SourceTree\app-3.1.2
Getting this AppCrash currently. Help. Supremely disappointed that there are so many issues with installing, updating and running SourceTree.

sourcetree.log in C:\Users\user\AppData\Local\Atlassian\SourceTree :
ERROR [2019-04-10 15:21:12,862] [1] [SourceTree.App] [.ctor] - finish EnsureSquirrelExecutionStubIsCopied
2019-04-10T15:27:27: no configuration section <common/logging> found - suppressing logging output
ERROR [2019-04-10 15:28:21,288] [1] [SourceTree.Analytics.Submission.Gas.GasAnalyticsSubmissionService] [Log] - Hi There!
ERROR [2019-04-10 15:30:47,869] [1] [SourceTree.Analytics.Submission.Gas.GasAnalyticsSubmissionService] [Log] - Hi There!
ERROR [2019-04-10 15:31:04,581] [1] [SourceTree.Analytics.Submission.Gas.GasAnalyticsSubmissionService] [Log] - Hi There!
ERROR [2019-04-10 15:31:50,265] [1] [SourceTree.Analytics.Submission.Gas.GasAnalyticsSubmissionService] [Log] - Hi There!
ERROR [2019-04-10 15:40:22,514] [1] [SourceTree.Analytics.Submission.Gas.GasAnalyticsSubmissionService] [Log] - Hi There!
Windows Event Viewer has:
Application: SourceTree.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: exception code c06d007e, exception address 000007FEFD67AAAD
Faulting application name: SourceTree.exe, version: 3.1.2.3027, time stamp: 0x5c90e109
Faulting module name: KERNELBASE.dll, version: 6.1.7601.18798, time stamp: 0x5507b87a
Exception code: 0xc06d007e
Fault offset: 0x000000000001aaad
Faulting process id: 0xaec
Faulting application start time: 0x01d4efee5fcada5c
Faulting application path: C:\Users\user\AppData\Local\SourceTree\app-3.1.2\SourceTree.exe
Faulting module path: C:\Windows\system32\KERNELBASE.dll
Report Id: a2692c4c-5be1-11e9-aaf6-005056e884c8
Fault bucket , type 0
Event Name: APPCRASH
Response: Not available
Cab Id: 0
Problem signature:
P1: SourceTree.exe
P2: 3.1.2.3027
P3: 5c90e109
P4: KERNELBASE.dll
P5: 6.1.7601.18798
P6: 5507b87a
P7: c06d007e
P8: 000000000001aaad
P9:
P10:
Attached files:
These files may be available here:
C:\Users\user\AppData\Local\Microsoft\Windows\WER\ReportArchive\AppCrash_SourceTree.exe_8236efd7576a3eca829b9e98b3cb6f2cec4c72a_13d0c042
Analysis symbol:
Rechecking for solution: 0
Report Id: a2692c4c-5be1-11e9-aaf6-005056e884c8
Report Status: 0