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update download link and adjust supported platforms
Tunderbird nightly builds as of 2019-05-18 and later include , including recent Betas and version 68.x release candidates, contain experimental supported for [https://en.wikipedia.org/wiki/Off-the-Record_Messaging Off-The-Record messaging (OTR)].
However, the OTR feature is disabled by default.
== Installing the external OTR library ==
Using the feature requires the [https://otr.cypherpunks.ca/ OTR library], which isn't yet included in the Thunderbird distribution. (We hope to fix that in the near future.) For the time being, so if you'll need d like to test the OTR feature, you must install it the required base libraries yourself. The installation steps depend on the platform you're using, please use them on your own risk, you should verify that you trust the origin of your downloads.
On Linux, your distribution probably offers the libOTR library.
* On systems like Debian or Ubuntu, use: sudo apt-get install libotr5
* On systems like Fedoraor CentOS, use: sudo dnf install libotr
On Mac OSX, you could obtain the packages from the [https://brew.sh/ homebrew] project. After you completed their general setup instructions, open a terminal and execute this command: brew install libotr
For 64-bit Windows systems, one of the Thunderbird developers provides a [https://kuix.de/mozilla/otr/W64-DLLlibs-2019031920190801/ download] on their private server. A README can be found on the site. In shortAfter you downloaded the respective file for your platform, after you and have verified the correctness of the download, you need to extract the zip archive file, find and move the files contained in the subdirectory named "bin", and move those files into to your Thunderbird application directory. This download probably only works with That's the same directory that contains other shared libraries and the Thunderbird for 64-bit Windows. For 32-bit Windows system, no download is currently availableexecutable.
== Enabling the OTR feature ==
