This issue is reproducible only with the attached project. Package Manager fails to compile and does not open as "FileNotFoundException" errors are thrown in console. Refer the attached video

Steps to reproduce;
1) Open attached project
2) Window > Package Manager > Select Cinemachine

Actual result: Package Manager does not open and "FileNotFoundException" is thrown in console

Expected result: Package Manager should open and no exceptions are thrown in console

Occurring on: 2020.2.0a1, 2020.1.0a26, 2020.1.0a23

Note: The project is made with 2020.1.0a23 and crashes on downgrading. I've tried deleting all temporary files and all assets from the project. I've also tried deleting Cinemachine and Timeline packages from package cache and have reproduced this bug in multiple systems

Environment: Occurs on Windows only