Steps to reproduce:
1. If pro user launch Unity using Command Prompt with -force-free argument
2. Create new project
3. If Editor doesn't crash restart PC and repeat steps 1-2

Expected results: Unity opens
Actual results: Editor crashes when there is a newer version.

Reproduced with: 2018.1.0b3, 2018.1.0b2
Not reproducible with: 2017.3.0f3, 2017.3.0f2
Regression introduced in: 2018.1.0b1

Before crash:
EditorUpdateCheck: Response {"latestversionstring":"2018.1.0b4 (003615bcffde)","latestversion":99999,"latestversionmessage":"A new version of Unity is available to test. Please update to the latest pre-release version at your convenience.\nRelease notes available on the download site.\n\nClick the \"Download new version\" button.","updateurl":"http://unity3d.com/unity/beta/","updateinterval":3600} updateurl = http://unity3d.com/unity/beta/ interval = 3600
Crash!!!

Stack trace:
0x0000000140BCFBCF (Unity) scripting_get_corlib
0x0000000140B9E59F (Unity) FindStaticMonoMethod
0x0000000140E8A75F (Unity) `anonymous namespace'::UpdateCheckMessage::Done
0x00000001401AFE29 (Unity) CurlRequest::Check
0x00000001401B03AF (Unity) CurlRequestCheck
0x0000000141E5CE51 (Unity) PackageManager::PackageAssets::ResolvePackages
0x0000000141E59A46 (Unity) PackageManager::Manifest::Refresh
0x0000000141E5E871 (Unity) PackageManager::Api::Initialize
0x0000000141E5D88A (Unity) `InitializeModule_PackageManager'::`2'::initializedPreloadedPluginsRegistrator::Forward
0x00000001406148C9 (Unity) CallbackArray::Invoke
0x00000001413A4DFE (Unity) Application::InitializeProject
0x00000001415A0CC1 (Unity) WinMain
0x000000014271ECC7 (Unity) __scrt_common_main_seh
0x00007FFA699C1FE4 (KERNEL32) BaseThreadInitThunk
0x00007FFA6A26EFB1 (ntdll) RtlUserThreadStart