Estou tendo o mesmo problema
20:53:30 - Operation OP_SETUP_DUALBOOT(13) with progress 88
20:53:39 - Operation OP_SETUP_DUALBOOT(13) - unpacked 8.5 Gb
20:53:39 - Operation OP_SETUP_DUALBOOT(13) with progress 89
20:53:47 - Operation OP_SETUP_DUALBOOT(13) - unpacked 8.6 Gb
20:53:47 - Operation OP_SETUP_DUALBOOT(13) with progress 90
20:53:56 - Operation OP_SETUP_DUALBOOT(13) - unpacked 8.7 Gb
20:53:56 - Operation OP_SETUP_DUALBOOT(13) with progress 91
20:54:05 - Operation OP_SETUP_DUALBOOT(13) - unpacked 8.8 Gb
20:54:05 - Operation OP_SETUP_DUALBOOT(13) with progress 92
20:54:14 - Operation OP_SETUP_DUALBOOT(13) - unpacked 8.9 Gb
20:54:15 - Operation OP_SETUP_DUALBOOT(13) with progress 93
20:54:23 - Operation OP_SETUP_DUALBOOT(13) - unpacked 9.0 Gb
20:54:23 - Operation OP_SETUP_DUALBOOT(13) with progress 94
20:54:34 - Operation OP_SETUP_DUALBOOT(13) - unpacked 9.1 Gb
20:54:34 - Operation OP_SETUP_DUALBOOT(13) with progress 95
20:54:34 - EndlessUsbToolDlg.cpp:4885 CEndlessUsbToolDlg::ExtendImageFile
20:54:34 - Trying to extend Endless image from 15907139584 bytes to 68719476736 bytes which is about 64 Gb
20:54:37 - Extended Endless image
20:54:37 - EndlessUsbToolDlg.cpp:4682 CEndlessUsbToolDlg::CopyMultipleItems
20:54:37 - Copying ‘C:\Users\leonardo\Downloads\EndlessBoot\grub’ to ‘C:\endless’
20:54:43 - EndlessUsbToolDlg.cpp:4936 CEndlessUsbToolDlg::IsLegacyBIOSBoot
20:54:43 - Operation OP_SETUP_DUALBOOT(13) with progress 98
20:54:43 - EndlessUsbToolDlg.cpp:5100 CEndlessUsbToolDlg::SetupEndlessEFI
20:54:43 - EndlessUsbToolDlg.cpp:5132 CEndlessUsbToolDlg::GetPhysicalFromDriveLetter
20:54:43 - Opened drive \.\PHYSICALDRIVE0 for write access
20:54:59 - Could not get exclusive access to device \.\PHYSICALDRIVE0: [0x00000005] Acesso negado.
20:54:59 - EndlessUsbToolDlg.cpp:5146 Error on acquiring disk handle. (GLE=[5])
20:54:59 - EndlessUsbToolDlg.cpp:5111 Error on acquiring disk handle. (GLE=[5])
20:54:59 - EndlessUsbToolDlg.cpp:4842 Error on SetupEndlessEFI (GLE=[5])
20:54:59 - SetupDualBoot exited with error.
20:54:59 - EndlessUsbToolDlg.cpp:4559 CEndlessUsbToolDlg::RemoveNonEmptyDirectory
20:55:00 - Removing directory ‘C:\endless’ result=0
20:55:00 - EndlessUsbToolDlg.cpp:4559 CEndlessUsbToolDlg::RemoveNonEmptyDirectory
20:55:01 - Removing directory ‘C:\Users\leonardo\Downloads\EndlessBoot’ result=0
20:55:01 - EndlessUsbToolDlg.cpp:4040 CEndlessUsbToolDlg::EnableHibernate
20:55:01 - EndlessUsbToolDlg.cpp:1552 CEndlessUsbToolDlg::ChangePage
20:55:01 - ChangePage requested from InstallingPage to ErrorPage
20:55:01 - Analytics.cpp:112 Analytics::screenTracking
20:55:01 - Analytics.cpp:158 Analytics::sendRequest
20:55:01 - Analytics.cpp:143 Analytics::exceptionTracking
20:55:01 - Analytics.cpp:158 Analytics::sendRequest
20:55:01 - Analytics req: v=1&tid=UA-61784217-3&cid=b2507b75-023a-4414-9d33-a56ec2af645f&an=Endless%20Installer&av=1.0.2.12&ul=en-US&cd1=Windows%2010%2064-bit%20(Build%2014393)&t=screenview&cd=ErrorPage
20:55:01 - Analytics: response code 200
20:55:01 - Analytics req: v=1&tid=UA-61784217-3&cid=b2507b75-023a-4414-9d33-a56ec2af645f&an=Endless%20Installer&av=1.0.2.12&ul=en-US&cd1=Windows%2010%2064-bit%20(Build%2014393)&t=exception&exd=ErrorCauseWriteFailed&exf=1
20:55:01 - Analytics: response code 200
20:56:56 - EndlessUsbToolDlg.cpp:789 CEndlessUsbToolDlg::Uninit
20:56:56 - Analytics.cpp:89 Analytics::sessionControl
20:56:56 - Analytics.cpp:158 Analytics::sendRequest
20:56:56 - Analytics req: v=1&tid=UA-61784217-3&cid=b2507b75-023a-4414-9d33-a56ec2af645f&an=Endless%20Installer&av=1.0.2.12&ul=en-US&cd1=Windows%2010%2064-bit%20(Build%2014393)&t=screenview&cd=LastPage&sc=end
20:56:56 - Analytics: response code 200
20:56:56 - CEndlessUsbToolDlg::CheckInternetConnectionThread cancel requested
20:56:56 - DownloadManager.cpp:439 DownloadManager::ClearExtraDownloadJobs
20:56:56 - Found a total of 3 download jobs.
20:56:56 - Found job 0 name extension_1_4_8_903.crx
20:56:56 - Found job 1 name 145_all_sthset.crx
20:56:56 - Found job 2 name extension_11_70_2.crx
20:56:56 - EndlessUsbToolDlg.cpp:3177 CEndlessUsbToolDlg::LeavingDevicesPage