I've just bought a Huawei Watch, and spent a very frustrating evening trying to set it up...the play store only installs the latest versions so I had AW2 on the phone but the watch was set up for AW1. It nearly worked, and I did actually get the watch up and running at one point; it took over half an hour updating stuff and starting to sync, but it lost the bluetooth connection before it had synced time and date, and could not re-establish it. So I had a watch with no connectivity, displaying the wrong time and date! I ended up unpairing and starting again...with no joy.
Finally the penny dropped, and I found the APK for the final version of AW1, and installed that on my phone. I then found that provided my phone was not plugged in to a charger and the watch was, that it could set itself up. I then tried upgrading to AW2 from the watch, and everything was fine. The last thing I did was to sync my google account. That took several attempts, until I ensured that both phone and watch were connected to the wifi with the watch in the charger.
So now all I need to do is to work out which apps to install,,,,,