Bug Error in unity hub, how to fix?

Unity installation begins. But when it all ends. It fades away
There are no notifications and errors. Everything just disappears.

 

What do the logs say?

 

Sorry, could you tell me where to find them? I'm new in this matter. Help.

 

Windows: %UserProfile%\AppData\Roaming\UnityHub\logs.

 

This?

 

Well, what are the errors say in there? Your screenshots are useless. You cut off the important parts: the errors.
So please read them, what the errors say?

 

Sorry
info-log:
{"moduleName":"UnityInstallStepsWindows","level":"warn","message":"[ { Error: spawn C:\\Windows\\system32\\cmd.exe; ENOENT\n at Process.ChildProcess._handle.onexit (internal/child_process.js:246:19)\n at onErrorNT (internal/child_process.js:429:16)\n at processTicksAndRejections (internal/process/task_queues.js:81:17)\n errno: 'ENOENT',\n code: 'ENOENT',\n syscall: 'spawn C:\\\\Windows\\\\system32\\\\cmd.exe;',\n path: 'C:\\\\Windows\\\\system32\\\\cmd.exe;',\n spawnargs:\n [ '-c',\n '\"C:\\\\Users\\\\User\\\\AppData\\\\Local\\\\Temp\\\\unityhub-007bf560-b0be-11ea-b89b-cb732d9b4d21\\\\UnitySetup64-2019.4.0f1.exe\" /S /D=D:\\\\Unity\\\\2019.4.0f1' ],\n cmd:\n '\"C:\\\\Users\\\\User\\\\AppData\\\\Local\\\\Temp\\\\unityhub-007bf560-b0be-11ea-b89b-cb732d9b4d21\\\\UnitySetup64-2019.4.0f1.exe\" /S /D=D:\\\\Unity\\\\2019.4.0f1' } ]","timestamp":"2020-06-17T17:25:24.527Z"}
{"moduleName":"UnityInstallerWindows","level":"warn","message":"[ 'error while installing the Editor! Trying to empty the folder! ',\n { error:\n { code: 'INSTALL_ERROR',\n message: 'Error happened while executing the installer. Aborting.' } } ]","timestamp":"2020-06-17T17:25:24.528Z"}
{"moduleName":"UnityInstallerWindows","level":"warn","message":"[ 'Failed to install editor and modules [object Object]' ]","timestamp":"2020-06-17T17:25:24.529Z"}
{"moduleName":"EditorManager","level":"warn","message":"[ 'There was an unhandled error while installing the editor:',\n { error:\n { code: 'INSTALL_ERROR',\n message: 'Error happened while executing the installer. Aborting.' } } ]","timestamp":"2020-06-17T17:25:24.530Z"}

 

I have the same problem

{"moduleName":"InstallerWinProcess","level":"info","message":"[ 'trying to connect to the ipc server' ]","timestamp":"2020-08-04T23:57:16.386Z"}
{"moduleName":"UnityIPCClient","level":"debug","message":"[ 'connecting to IPC Server Unity-hubInstallServer' ]","timestamp":"2020-08-04T23:57:16.387Z"}
{"moduleName":"UnityInstallStepsWindows","level":"debug","message":"[ 'beforeEditorInstallation' ]","timestamp":"2020-08-04T23:58:57.362Z"}
{"moduleName":"UnityInstallStepsWindows","level":"debug","message":"[ 'execInstaller' ]","timestamp":"2020-08-04T23:58:57.364Z"}
{"moduleName":"UnityInstallStepsWindows","level":"debug","message":"[ 'installFromExe' ]","timestamp":"2020-08-04T23:58:57.365Z"}
{"moduleName":"UnityInstallStepsWindows","level":"info","message":"[ 'install C:\\\\Users\\\\zSkyl\\\\AppData\\\\Local\\\\Temp\\\\unityhub-3966e680-d6ae-11ea-9edd-81ada708edd0\\\\UnitySetup64-2020.1.0f1.exe /S /D=C:\\\\Program Files\\\\Unity\\\\Hub\\\\Editor\\\\2020.1.0f1' ]","timestamp":"2020-08-04T23:58:57.365Z"}
{"moduleName":"UnityInstallStepsWindows","level":"warn","message":"[ { Error: spawn cmd.exe ENOENT\n at Process.ChildProcess._handle.onexit (internal/child_process.js:246:19)\n at onErrorNT (internal/child_process.js:429:16)\n at processTicksAndRejections (internal/process/task_queues.js:81:17)\n errno: 'ENOENT',\n code: 'ENOENT',\n syscall: 'spawn cmd.exe',\n path: 'cmd.exe',\n spawnargs:\n [ '/d',\n '/s',\n '/c',\n '\"\"C:\\\\Users\\\\zSkyl\\\\AppData\\\\Local\\\\Temp\\\\unityhub-3966e680-d6ae-11ea-9edd-81ada708edd0\\\\UnitySetup64-2020.1.0f1.exe\" /S /D=C:\\\\Program Files\\\\Unity\\\\Hub\\\\Editor\\\\2020.1.0f1\"' ],\n cmd:\n '\"C:\\\\Users\\\\zSkyl\\\\AppData\\\\Local\\\\Temp\\\\unityhub-3966e680-d6ae-11ea-9edd-81ada708edd0\\\\UnitySetup64-2020.1.0f1.exe\" /S /D=C:\\\\Program Files\\\\Unity\\\\Hub\\\\Editor\\\\2020.1.0f1' } ]","timestamp":"2020-08-04T23:58:57.373Z"}

 

Same overhere, any solution to this as is preventing me to work on my projects:
{"moduleName":"DownloadManager","level":"info","message":"[ 'download ended with status: 3 C:\\\\Users\\\\Jose\\\\AppData\\\\Local\\\\Temp\\\\unityhub-bb9c0b71-dcc7-11ea-8700-a952ec348c21\\\\UnitySetup64-2019.4.7f1.exe' ]","timestamp":"2020-08-12T18:17:45.075Z"}
{"moduleName":"Download","level":"info","message":"[ 'Editor download ended successfully. Download id: 2019.4.7f1' ]","timestamp":"2020-08-12T18:17:51.945Z"}
{"moduleName":"Installer","level":"info","message":"[ 'Install 2019.4.7f1: C:\\\\Users\\\\Jose\\\\AppData\\\\Local\\\\Temp\\\\unityhub-bb9c0b71-dcc7-11ea-8700-a952ec348c21\\\\UnitySetup64-2019.4.7f1.exe to C:\\\\Program Files\\\\Unity\\\\2019.4.7f1 started' ]","timestamp":"2020-08-12T18:17:51.946Z"}
{"moduleName":"EditorManager","level":"warn","message":"[ 'There was an unhandled error while installing the editor:',\n { error:\n { code: 'INSTALL_ERROR',\n message: 'Error happened while executing the installer. Aborting.' } } ]","timestamp":"2020-08-12T18:17:51.946Z"}

 

i also have an error and cannot install unity
{ Error: spawn C:\\WINDOWS\\system32\\cmd.exe ENOENT\n at Process.ChildProcess._handle.onexit (internal/child_process.js:246:19)\n at onErrorNT (internal/child_process.js:429:16)\n at processTicksAndRejections (internal/process/task_queues.js:81:17)\n errno: 'ENOENT',\n code: 'ENOENT',\n syscall: 'spawn C:\\\\WINDOWS\\\\system32\\\\cmd.exe',\n path: 'C:\\\\WINDOWS\\\\system32\\\\cmd.exe',\n spawnargs:\n [ '/d',\n '/s',\n '/c',\n '\"\"C:\\\\Users\\\\WRI0020\\\\AppData\\\\Local\\\\Temp\\\\unityhub-c6fdea00-669d-11eb-adf8-a943e76fc923\\\\UnitySetup64-2019.4.19f1.exe\" /S /D=C:\\\\Program Files\\\\Unity\\\\Hub\\\\Editor\\\\2019.4.19f1\"' ],\n cmd:\n '\"C:\\\\Users\\\\WRI0020\\\\AppData\\\\Local\\\\Temp\\\\unityhub-c6fdea00-669d-11eb-adf8-a943e76fc923\\\\UnitySetup64-2019.4.19f1.exe\" /S /D=C:\\\\Program Files\\\\Unity\\\\Hub\\\\Editor\\\\2019.4.19f1' } ]","timestamp":"2021-02-04T04:09:55.620Z"}