Merge pull request #1016 from NordicSemiconductor/doc_add_installatio…

…n_link_fix

doc: add installation cross-links

doc/docs/download_cfd.md

@@ -3,32 +3,44 @@
 Download nRF Connect for Desktop's executable from Nordic Semiconductor's [website](https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Connect-for-desktop).
 
 All nRF Connect for Desktop applications require the launcher v4.1.0 or later.
+See also the list of [Supported operating systems](./os_support.md).
 
 After installing and starting the launcher, you will see the list of available apps.
 See the [Launcher overview](overview_cfd.md) and [Installing nRF Connect for Desktop apps](installing_apps.md) pages for more information.
 
 ## Additional requirements
 
-Running nRF Connect for Desktop on macOS and Linux has additional requirements.
+Running nRF Connect for Desktop has the following additional requirements.
 
-### J-Link driver on macOS and Linux
+### SEGGER J-Link driver
 
-You must install SEGGER J-Link driver separately on macOS and Linux. To do so, download and
-install it from [SEGGER](https://www.segger.com/downloads/jlink) under the
-section _J-Link Software and Documentation Pack_.
+Required on all platforms.
 
-If you don't install the J-Link driver, running the apps will fail and you will get error messages
-`CouldNotFindJprogDLL`, `CouldNotOpenDLL`, `JLINKARM_DLL_NOT_FOUND`, or similar.
+On Windows, the driver comes bundled with nRF Connect for Desktop.
 
-### udev rules for Linux only
+On macOS and Linux, you must install the driver manually.
+Download the installer for your platform from [SEGGER J-Link Software](https://www.segger.com/downloads/jlink/#J-LinkSoftwareAndDocumentationPack).
+If you don't install the J-Link driver, running the apps will be very limited and you will get error messages `CouldNotFindJprogDLL`, `CouldNotOpenDLL`, `JLINKARM_DLL_NOT_FOUND`, or similar.
 
-In order to access Nordic USB devices with correct permissions, you must set up _udev_ rules.
-To do so, follow the instructions in the [nrf-udev](https://github.com/NordicSemiconductor/nrf-udev)
-repository. You need to set up these rules only once.
+### Installing libusb-1.0-0 and nrf-udev on Linux
+
+libusb-1.0-0 usually comes installed with Ubuntu.
+
+nrf-udev can be installed by downloading a DEB file from the [nrf-udev](https://github.com/NordicSemiconductor/nrf-udev) project repository.
+
+The _udev_ rules are required to access Nordic USB devices with correct permissions.
+You need to set up these rules only once.
+
+Complete the following steps:
+
+1. Download the latest DEB file from [nrf-udev](https://github.com/NordicSemiconductor/nrf-udev).
+2. Run the following command to install nrf-udev:
+
+    ```
+    sudo dpkg -i nrf-udev_1.0.1-all.deb
+    ```
 
 ## Using behind proxy
 
 To use nRF Connect for Desktop and its applications behind a proxy, see the
 [Starting nRF Connect for Desktop with proxy settings](./proxy_settings.md) page.
-
-

doc/docs/os_support.md

@@ -14,6 +14,7 @@ The following table lists operating systems supported by nRF Connect for Desktop
 | macOS 11                  | Not applicable | Tier 2        | Tier 2        |
 | macOS 10.15               | Not applicable | Tier 3        | Not supported |
 
+To download and install nRF Connect for Desktop, see [Requirements and installation](./download_cfd.md).
 Linux and macOS have [additional installation requirements](download_cfd.md#requirements).
 
 !!! info "Tier definitions"