Flash plugin install fails silently on Win 8.1.

Question

Reports success. But the adobe site which checks for it verifies it is not there and firefox keeps asking for it.
Tried all listed methods at mozilla and adobe pages. This started a couple of weeks ago. I have Firefox 33.1.1.
I'd like to do a manual install. But the directory where adobe is putting its files (under Windows, SysWOW something containing MacroMed dir) does not contain any files with the file types the manual install wizard requires ( .xpi and.jar).
This is the last bin in the flash install log:
=O====== M/15.0.0.239 2014-11-30+05-25-06.799 ========
0000 [I] 00000010 "C:\Users\Megan\Downloads\install_flash_player(2).exe"
0001 [I] 00000011 1
0002 [W] 00001036 Software\Mozilla\Firefox\extensions/Plugins 2
0003 [W] 00001036 Software\Mozilla\Mozilla Firefox\extensions/Plugins 2
0004 [W] 00001036 Software\Mozilla\Mozilla Thunderbird\extensions/Plugins 2
0005 [W] 00001036 Software\Mozilla\Thunderbird\extensions/Plugins 2
0006 [W] 00001036 Software\Opera Software/Last CommandLine 2
0007 [W] 00001036 Software\Opera Software/Last CommandLine 2
0008 [W] 00001036 Software\Opera Software/Plugin Path 2
0009 [W] 00001036 Software\Opera Software/Plugin Path 2
0010 [I] 00000014
0011 [I] 00000015 C:\Windows\SysWOW64\Macromed\Flash\FlashUtil32_15_0_0_239_Plugin.exe
0012 [I] 00000024 C:\Windows\SysWOW64\Macromed\Flash\plugin.vch
0013 [I] 00000017 C:\Windows\SysWOW64\Macromed\Flash
0014 [I] 00000022 C:\Windows\SysWOW64\Macromed\Flash\FlashPlayerPlugin_15_0_0_239.exe
0015 [I] 00000021 C:\Windows\SysWOW64\Macromed\Flash\FlashPlayerUpdateService.exe
0016 [W] 00001106
0017 [W] 00001106
0018 [W] 00001024 C:\Windows\SysWOW64\Macromed\Flash\FlashPlayerUpdateService.exe 183
=X====== M/15.0.0.239 2014-11-30+05-25-30.392 ========
Trouble shooting info:
Application Basics
Name: Firefox
Version: 33.1.1
User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0
Multiprocess Windows: 0/1
Crash Reports for the Last 3 Days
All Crash Reports
Extensions
Name: F.B. Purity - Cleans Up Facebook
Version: 9.3.2
Enabled: true
ID: [email protected]
Name: Flashblock
Version: 1.5.17
Enabled: true
ID: {3d7eb24f-2740-49df-8937-200b1cc08f8a}
Name: Ghostery
Version: 5.4.1
Enabled: true
ID: [email protected]
Name: LastPass
Version: 3.1.1
Enabled: true
ID: [email protected]
Name: Troubleshooter
Version: 1.1a
Enabled: true
ID: [email protected]
Name: Dangerous Websites Blocker
Version: 4.5.3.8
Enabled: false
ID: [email protected]
Name: Safe Money
Version: 4.5.3.8
Enabled: false
ID: [email protected]
Name: Virtual Keyboard
Version: 4.5.3.8
Enabled: false
ID: [email protected]
Name: YouTube Flash Video Player
Version: 33.3
Enabled: false
ID: {f3bd3dd2-2888-44c5-91a2-2caeb33fb898}
Name: YouTube™ Flash® Player
Version: 1.2
Enabled: false
ID: jid1-HAV2inXAnQPIeA@jetpack
Graphics
Adapter Description: AMD Radeon HD 8650G
Adapter Drivers: aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64
Adapter RAM: 768
Device ID: 0x990b
Direct2D Enabled: true
DirectWrite Enabled: true (6.3.9600.17111)
Driver Date: 8-19-2013
Driver Version: 13.151.0.0
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Vendor ID: 0x1002
WebGL Renderer: Google Inc. -- ANGLE (AMD Radeon HD 8650G Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0
Important Modified Preferences
accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 2
browser.places.smartBookmarksVersion: 7
browser.sessionstore.upgradeBackup.latestBuildID: 20141113143407
browser.startup.homepage_override.buildID: 20141113143407
browser.startup.homepage_override.mstone: 33.1.1
browser.tabs.warnOnClose: false
dom.allow_scripts_to_close_windows: true
dom.mozApps.used: true
extensions.lastAppVersion: 33.1.1
font.internaluseonly.changed: false
gfx.direct3d.last_used_feature_level_idx: 0
media.gmp-gmpopenh264.enabled: true
media.gmp-gmpopenh264.lastUpdate: 1413347647
media.gmp-gmpopenh264.version: 1.1
media.gmp-manager.lastCheck: 1417714123
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1417670751
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugin.scan.plid.all: false
plugin.state.npcontentblocker: 2
plugin.state.nponlinebanking: 2
plugin.state.npvkplugin: 2
privacy.sanitize.migrateFx3Prefs: true
security.disable_button.openCertManager: false
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1417060985
user.js Preferences
Your profile folder contains a user.js file, which includes preferences that were not created by Firefox.
Important Locked Preferences
JavaScript
Incremental GC: true
Accessibility
Activated: true
Prevent Accessibility: 0
Library Versions
NSPR
Expected minimum version: 4.10.7
Version in use: 4.10.7
NSS
Expected minimum version: 3.17.2 Basic ECC
Version in use: 3.17.2 Basic ECC
NSSSMIME
Expected minimum version: 3.17.2 Basic ECC
Version in use: 3.17.2 Basic ECC
NSSSSL
Expected minimum version: 3.17.2 Basic ECC
Version in use: 3.17.2 Basic ECC
NSSUTIL
Expected minimum version: 3.17.2
Version in use: 3.17.2
Experimental Features
---------------------

Answer 1

Hi,
I'm a bit confused with your description, as you said adobe flash player couldn't play any vedio. How about Youtube vedio? Does it works fine?
It would be better to provide an example link for your problem, then I would made an test for you.
Roger Lu
TechNet Community Support