Good day, members of the forum!
I ran into such a problem – I downloaded the latest version of the Chromium browser on Windows 7/8 (the plugin does not work on both Windows), then I found that videos on sites do not load and music in contact does not play. A message appears: Adobe Flash Player is not installed, a link is offered where you can install it. I follow the link, the site determines that the player is actually installed, but not turned on. They write that you need to go to the address: chrome: plugins and activate the plugin, but it is not in the list at all!
Instructions from here didn’t help:
Adobe Flash Player Plugin .
The player downloaded from here: Adobe Flash Player
Help, please, I don’t know what to do anymore!
List of available plugins: 
Answer 1, authority 100%
Chrome and Chromium are different products. Be careful, Chromium is a source code project that has a lot of build settings. Last year Google announced that they were abandoning NPAPI, as a result, they rewrote all built-in plugins using PPAPI. For Chromium to support Flash, it must be compiled with a special flag, and this, as far as I remember, requires a PPAPI library for your platform.
Answer 2, authority 100%
Chromium 44.0.2359
I put it on the link
https://fpdownload.adobe.com/pub/flashplayer/latest/help /install_flash_player_ppapi.exe
Launched Chromium, everything worked right away and flash appeared in chrome: // plugins.
Also in the directory / Windows / System32 / Macromed / Flash / there is a file “pepflashplayer32_17_0_0_169.dll”
Answer 3, authority 67%
@Kristya Only installing a previous version of Chromium will help. I installed version 41.0.2258.0 instead of 42.0.2293.0 – the problem with Flash Player was solved.
Answer 4, authority 67%
For the sake of experiment, I wanted to put pure Chromium 43.0.2342.0 on XP, it turned out that he does not see the flash installed in the system.
From the comment above, I learned about the abandonment of NPAPI.
Looked for “plugin” and “flash” in the command list (peter.sh/experiments/chromium-command-line-switches ).
The --enable-npapi option stops the yellow error bar from appearing, but does not release the built-in NPAPI lock.
You can enable it temporarily (Run all plugins this time) or for a specific site by clicking on the icon in the address bar.
The plugin lock icon in this case seems to be visible all the time.
BTW, YouTube uses HTML5 despite NPAPI permission.
It was also possible to connect PPAPI flash with NPAPI installed in the system.
I pulled out the DLL from the PPAPI for Chromium installer from the Adobe website, put it in the program folder.
Launched with parameters --ppapi-flash-path = "pepflashplayer32_17_0_0_134.dll" --ppapi-flash-version = "17.0.0.134"
Everything works. The plugin on the page chrome: // plugins is visible.
By the way, without specifying the exact version, the number of the old version of the plugin is returned. Then the plugin is not accepted.
Although for this case there is --allow-outdated-plugins ))) The plugin works, but mistakenly asks for an update.
Originally looking for portable Chromium (there are candidates with chromium.woolyss.com ), but not sure if parameters can be passed to the launcher.
Let’s dig.
P.S. I found very detailed instructions at http://chromium.woolyss.com/#flash