Avast SecureLine VPN is multidevice :
you can install it on Windows and MAC and Android and iOS.

Region:Global
License type:Retail license key xxxx-xxxxxxxx-xxxx
License term(days): 365
License delivery:Immediately
CD Box:No
The authorized number of users1 User - 10 Devices

for installing and activating visit the below page:
https://support.avast.com/en-us/article/Install-SecureLine-V

Additional information
The official license key delivers immediately after payment automatically.
A countdown of 365 days will be started from the first activation you do.