Install git, install SourceTree without registration: configure accounts.json, configure user.config

1. Install [Git-2.31.0-64-bit], install [SourceTreeSetup-3.4.5]

2. Create the [accounts.json] file in the [  %LocalAppData%\Atlassian\SourceTree\  ] directory

 [
  {
    "$id": "1",
    "$type": "SourceTree.Api.Host.Identity.Model.IdentityAccount, SourceTree.Api.Host.Identity",
    "Authenticate": true,
    "HostInstance": {
      "$id": "2",
      "$type": "SourceTree.Host.Atlassianaccount.AtlassianAccountInstance, SourceTree.Host.AtlassianAccount",
      "Host": {
        "$id": "3",
        "$type": "SourceTree.Host.Atlassianaccount.AtlassianAccountHost, SourceTree.Host.AtlassianAccount",
        "Id": "atlassian account"
      },
      "BaseUrl": "https://id.atlassian.com/"
    },
    "Credentials": {
      "$id": "4",
      "$type": "SourceTree.Model.BasicAuthCredentials, SourceTree.Api.Account",
      "Username": "",
      "Email": null
    },
    "IsDefault": false
  }
]

3. Open %LocalAppData%\Atlassian and enter "SourceTree.exe_Url_iay..." (Note that this directory may be version-related, and the paths in different versions may not be exactly the same.) 

Then enter the software version "3.4.5.0" directory

Open the user.config file and add it

<setting name="AgreedToEULA" serializeAs="String">
     <value>True</value>
</setting>

<setting name="AgreedToEULAVersion" serializeAs="String">
    <value>20160201</value>
</setting>

 4. Re-open Sourcetree and enter your account name and email address.