Python 64비트 설치 시 0x80070659 오류 발생
윈도우 용 파이썬 설치 파일을 이용하는 경우, 마지막 단계에서 다음과 같은 오류가 발생합니다.

Setup failed
One or more issues caused the setup to fail. Please fix the issues and then retry setup. For more information see the log file.
0x80070659 - This installation is forbidden by system policy. Contact your system administrator.
로그 파일의 링크를 누르면 이런 식의 내용이 나오고,
...[이전 생략]...
[207C:24C8][2016-12-23T00:30:04]i360: Creating a system restore point.
[207C:24C8][2016-12-23T00:30:04]i362: System restore disabled, system restore point not created.
[0E58:1DF4][2016-12-23T00:30:04]i370: Session begin, registration key: SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{d46281ac-f66b-4246-8cfe-34f61512982f}, options: 0x7, disable resume: No
[0E58:1DF4][2016-12-23T00:30:04]i000: Caching bundle from: '%USERPROFILE%\AppData\Local\Temp\2\{d46281ac-f66b-4246-8cfe-34f61512982f}\.be\python-3.5.2-amd64.exe' to: '%USERPROFILE%\AppData\Local\Package Cache\{d46281ac-f66b-4246-8cfe-34f61512982f}\python-3.5.2-amd64.exe'
[0E58:1DF4][2016-12-23T00:30:04]i320: Registering bundle dependency provider: {d46281ac-f66b-4246-8cfe-34f61512982f}, version: 3.5.2150.0
[0E58:1DF4][2016-12-23T00:30:04]i371: Updating session, registration key: SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{d46281ac-f66b-4246-8cfe-34f61512982f}, resume: Active, restart initiated: No, disable resume: No
[0E58:2578][2016-12-23T00:30:04]i305: Verified acquired payload: core_JustForMe at path: %USERPROFILE%\AppData\Local\Package Cache\.unverified\core_JustForMe, moving to: %USERPROFILE%\AppData\Local\Package Cache\{E151A5E4-D373-4388-82FB-0C9F5F6CFB76}v3.5.2150.0\core.msi.
[0E58:1DF4][2016-12-23T00:30:04]i323: Registering package dependency provider: {E151A5E4-D373-4388-82FB-0C9F5F6CFB76}, version: 3.5.2150.0, package: core_JustForMe
[0E58:1DF4][2016-12-23T00:30:04]i301: Applying execute package: core_JustForMe, action: Install, path: %USERPROFILE%\AppData\Local\Package Cache\{E151A5E4-D373-4388-82FB-0C9F5F6CFB76}v3.5.2150.0\core.msi, arguments: ' ARPSYSTEMCOMPONENT="1" MSIFASTINSTALL="7" TARGETDIR="%USERPROFILE%\AppData\Local\Programs\Python\Python35" OPTIONALFEATURESREGISTRYKEY="Software\Python\PythonCore\3.5\InstalledFeatures"'
[0E58:2578][2016-12-23T00:30:04]i305: Verified acquired payload: dev_JustForMe at path: %USERPROFILE%\AppData\Local\Package Cache\.unverified\dev_JustForMe, moving to: %USERPROFILE%\AppData\Local\Package Cache\{5397E020-59CB-43BF-A0FE-32B26DE98187}v3.5.2150.0\dev.msi.
[0E58:2578][2016-12-23T00:30:04]i305: Verified acquired payload: exe_JustForMe at path: %USERPROFILE%\AppData\Local\Package Cache\.unverified\exe_JustForMe, moving to: %USERPROFILE%\AppData\Local\Package Cache\{24C31CC2-A8F2-417E-A61B-5E682D39893B}v3.5.2150.0\exe.msi.
[0E58:1DF4][2016-12-23T00:30:04]e000: Error 0x80070659: Failed to install MSI package.
[0E58:1DF4][2016-12-23T00:30:04]e000: Error 0x80070659: Failed to configure per-user MSI package.
[0E58:1DF4][2016-12-23T00:30:04]i319: Applied execute package: core_JustForMe, result: 0x80070659, restart: None
[0E58:1DF4][2016-12-23T00:30:04]e000: Error 0x80070659: Failed to execute MSI package.
[0E58:1DF4][2016-12-23T00:30:04]i318: Skipped rollback of package: core_JustForMe, action: Uninstall, already: Absent
[0E58:1DF4][2016-12-23T00:30:04]i319: Applied rollback package: core_JustForMe, result: 0x0, restart: None
[0E58:1DF4][2016-12-23T00:30:04]i329: Removed package dependency provider: {E151A5E4-D373-4388-82FB-0C9F5F6CFB76}, package: core_JustForMe
[0E58:1DF4][2016-12-23T00:30:04]i351: Removing cached package: core_JustForMe, from path: %USERPROFILE%\AppData\Local\Package Cache\{E151A5E4-D373-4388-82FB-0C9F5F6CFB76}v3.5.2150.0\
[0E58:2578][2016-12-23T00:30:05]i304: Verified existing payload: lib_JustForMe at path: %USERPROFILE%\AppData\Local\Package Cache\{976C50E6-00DF-40A6-9E59-70A4F3EF4E32}v3.5.2150.0\lib.msi.
[0E58:2578][2016-12-23T00:30:05]e000: Error 0x80070642: BA aborted verify of payload: lib_JustForMe
[0E58:2578][2016-12-23T00:30:05]e314: Failed to cache payload: lib_JustForMe from working path: %USERPROFILE%\AppData\Local\Temp\2\{d46281ac-f66b-4246-8cfe-34f61512982f}\lib_JustForMe, error: 0x80070642.
[0E58:2578][2016-12-23T00:30:05]i351: Removing cached package: exe_JustForMe, from path: %USERPROFILE%\AppData\Local\Package Cache\{24C31CC2-A8F2-417E-A61B-5E682D39893B}v3.5.2150.0\
[0E58:2578][2016-12-23T00:30:05]i351: Removing cached package: dev_JustForMe, from path: %USERPROFILE%\AppData\Local\Package Cache\{5397E020-59CB-43BF-A0FE-32B26DE98187}v3.5.2150.0\
[0E58:2578][2016-12-23T00:30:05]i351: Removing cached package: core_JustForMe, from path: %USERPROFILE%\AppData\Local\Package Cache\{E151A5E4-D373-4388-82FB-0C9F5F6CFB76}v3.5.2150.0\
[0E58:2578][2016-12-23T00:30:05]w353: Unable to remove cached package: core_JustForMe, from path: %USERPROFILE%\AppData\Local\Package Cache\{E151A5E4-D373-4388-82FB-0C9F5F6CFB76}v3.5.2150.0\, reason: 0x80070003. Continuing...
[0E58:1DF4][2016-12-23T00:30:05]i372: Session end, registration key: SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{d46281ac-f66b-4246-8cfe-34f61512982f}, resume: None, restart: None, disable resume: No
[0E58:1DF4][2016-12-23T00:30:05]i330: Removed bundle dependency provider: {d46281ac-f66b-4246-8cfe-34f61512982f}
[0E58:1DF4][2016-12-23T00:30:05]i352: Removing cached bundle: {d46281ac-f66b-4246-8cfe-34f61512982f}, from path: %USERPROFILE%\AppData\Local\Package Cache\{d46281ac-f66b-4246-8cfe-34f61512982f}\
[0E58:1DF4][2016-12-23T00:30:05]i371: Updating session, registration key: SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{d46281ac-f66b-4246-8cfe-34f61512982f}, resume: None, restart initiated: No, disable resume: No
[0E58:1DF4][2016-12-23T00:30:05]i399: Apply complete, result: 0x80070659, restart: None, ba requested restart: No
원인은 다음의 덧글에 나옵니다.
How to fix "Installation is forbidden by system policy" error when installing .NET Framework 4
; https://answers.microsoft.com/en-us/windows/forum/all/how-to-fix-installation-is-forbidden-by-system/d86f95f5-3df9-4780-afac-10e2c598843a
그러니까, 파이썬 설치 파일을 저장한 다음 마우스 우 클릭을 해 "관리자 권한으로 실행(Run as administrator)"을 선택하면 해결됩니다. ^^
[이 글에 대해서 여러분들과 의견을 공유하고 싶습니다. 틀리거나 미흡한 부분 또는 의문 사항이 있으시면 언제든 댓글 남겨주십시오.]