I just installed the Voice Control update version 31466196AA and entire US Map version 1186. Following are detailed instructions. The two processes are almost identical. I've had successful and failed updates in the past, so my recommendations are based on those experiences.
For US updates, start by navigating to the following website and either click on the link for the voice control update or the appropriate map update. The voice and map updates must be performed separately - finish installing one in the car before erasing the thumb drive and starting the second. In my description below it may sound like I'm doing them simultaneously, but that's just because I didn't want to list all of the steps a second time. Previously, both updates could be simultaneously loaded on a thumb drive and installed in sequence, but that must have caused problems and now Volvo has broken them up.:
I believe that FAT32, exFAT or NTFS formatted thumb drives will work. I used a 64GB thumb drive formatted in exFAT and a Windows PC. I believe that Volvo dealers only install the regional maps - probably because it's faster. So if you want the entire US map you will have to update it yourself.
1. Make sure all files have been deleted from the thumb drive and that it's formatted as FAT32, exFAT or NTFS. If you aren't sure how it's formatted, you can re-format it by right-clicking on the thumb drive icon in Windows Explorer and selecting "Format", which will also erase all of the files on the thumb drive.
2. Although the Voice Control update is only 8GB, you will need a 64GB thumb drive for the entire US map update.
3. Connect the empty thumb drive to your PC and click the appropriate download link from the Volvo web page. Note that the first file that downloads is an installer - not the update files. You need to save the installer program to your desktop - don't save it to the thumb drive.
4. Double-click the Sensus_Update installer icon on your desktop to launch the installer application. Note that different installer applications are required for the map vs. the voice control updates. Once you are finished with one update, you can delete that installer and download the other one to your desktop to start the second update.
5. Choose "New Download", "USB" installation, navigate to the thumb drive and select it. Note that all files should be installed at the thumb drive's root level - do not install them inside of another folder.
6. Wait for all files to download. It took about 20 minutes for the voice control files to download to my thumb drive and two hours for the entire US map data. Click the "Finish" button and close the program.
7. Re-open the installer program and select "Check Download" or "Verify" depending on the program.
8. Navigate to the thumb drive and select it. Wait for the program to verify the files. Note: I'm not sure if verifying the files is really necessary, but it only takes a few seconds to verify the voice control files and a few minutes to verify the map files.
9. Select "Finish", close the program and eject the thumb drive properly (click on the "Safely Remove Hardware and Eject Media" button in the lower right hand corner of the desktop).
10. The voice control update takes about 10 minutes to install in the car and the entire US map data takes about 30 minutes (at least that's how long my updates took - others have reported longer times). You can install an update while driving or while sitting in your car with the engine off. I installed both updates with the ignition turned off and the driver's door open. If the engine is off, the Sensus screen will dim every three minutes and you have to touch it to keep it awake. At 14 minutes there will be a power conservation message where you need to select "continue" to keep Sensus turned on. Keep in mind that Sensus will turn off and the update will be interrupted if you turn off the ignition and then open the driver's door. If you are installing an update while driving and reach your destination before the update has finished, then open the driver's door before you turn off the ignition to prevent Sensus from going to sleep. Supposedly the updates will resume automatically after Sensus goes to sleep and then wakes up again, but in my experience that's when an error is most likely to occur so now I try to prevent any interruptions during the updating process and keep Sensus awake during the entire update.
11. When you're ready to begin the installation, wait for Sensus to boot up and then insert the thumb drive into the USB port underneath the arm rest. Sensus should recognize the files and begin updating after you confirm your intention to replace the existing data. To check whether or not the voice control update is complete, press the tab icon at the top edge - middle of the screen to get to the Settings screen. If only the voice control updating message is displayed, then the process is ongoing. It will not show a % complete message for the voice control update. When the voice control update is finished, a second message will appear on the same screen stating that it has finished. Only then should you remove the thumb drive from the USB port. IMPORTANT - do not remove the thumb drive until you are certain that the update is complete. Even if the update looks like it has hung up, DO NOT remove the thumb drive until you're sure that it's complete. I removed my thumb drive during a map update that got hung up and it required a visit to my dealer to fix the problem. Meanwhile, maps, CarPlay and speed limit sign recognition were offline. Fortunately, the map update does give you a % complete status on the home screen, so you can verify that progress is being made for the map update. If either update finishes without you noticing, you can check the Settings screen to see a message stating that it's complete. At that point, it's safe to remove the thumb drive.
12. Once the update is complete and you've removed the thumb drive, turn off the car, exit, close the door and lock it. Wait a few seconds to make sure Sensus goes to sleep. The voice control update should be ready to go immediately after installation, but the map update needs the final Sensus reboot to finish. When the map update is finally complete after the Sensus reboot there will be a message on the Settings screen confirming it.
One final recommendation I would make is to buy a short USB extension cable to help protect the car's USB port which seems to be very fragile. You leave the short extension cable plugged into the car all the time and plug everything into the other end of the extension cable. It's much easier to verify the orientation of the USB connection this way, and if you break the extension cable's port it's cheap and easy to replace it. My car's USB port broke even though we've been very careful with it, and another SwedeSpeed member experienced the same failure. Here is the extension cable I purchased from Amazon:
StarTech.com 6-Inch USB 3.0 Extension Adapter USB 3.0 Port Saver Cable, Black (USB3EXT6INBK)