Steps to reproduce the issue

using latest 4.4
set the update channel to testing https://update.joomla.org/core/nightlies/next_major_list.xml
update to joomla 5

Expected result

success

Actual result

0 Joomla\Filesystem\File::delete: Failed deleting inaccessible file Joomla_5.0.0-alpha3-dev-Development-Update_Package.zip

Call stack
--
# | Function | Location
1 | () | JROOT\libraries\vendor\joomla\filesystem\src\File.php:136
2 | Joomla\Filesystem\File::delete() | JROOT\administrator\components\com_joomlaupdate\src\Model\UpdateModel.php:482
3 | Joomla\Component\Joomlaupdate\Administrator\Model\UpdateModel->downloadPackage() | JROOT\administrator\components\com_joomlaupdate\src\Model\UpdateModel.php:398
4 | Joomla\Component\Joomlaupdate\Administrator\Model\UpdateModel->download() | JROOT\administrator\components\com_joomlaupdate\src\Controller\UpdateController.php:56
5 | Joomla\Component\Joomlaupdate\Administrator\Controller\UpdateController->download() | JROOT\libraries\src\MVC\Controller\BaseController.php:692
6 | Joomla\CMS\MVC\Controller\BaseController->execute() | JROOT\libraries\src\Dispatcher\ComponentDispatcher.php:143
7 | Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch() | JROOT\libraries\src\Component\ComponentHelper.php:361
8 | Joomla\CMS\Component\ComponentHelper::renderComponent() | JROOT\libraries\src\Application\AdministratorApplication.php:143
9 | Joomla\CMS\Application\AdministratorApplication->dispatch() | JROOT\libraries\src\Application\AdministratorApplication.php:186
10 | Joomla\CMS\Application\AdministratorApplication->doExecute() | JROOT\libraries\src\Application\CMSApplication.php:293
11 | Joomla\CMS\Application\CMSApplication->execute() | JROOT\administrator\includes\app.php:61
12 | require_once() | JROOT\administrator\index.php:32

System information (as much as possible)

Additional comments

also tested with #41117 to see if that made a difference