It might be possible to enable SMBv1 in Windows 10 again, but this would be completely on your own responsibility and we can´t provide support for non-Zyxel products: Have a look: Microsoft SMBv1 enable or in our knowledge bas
So there won´t be an upgrade to SMBv2 or SMBv3. Unfortunately, there won´t be new software updates for the NSA series.Zyxel NAS devices achieve authentication by using the web.cgi CGI executable Multiple Zyxel network-attached storage (NAS) devices running firmware version 5.21 contain a pre-authentication command injection vulnerability, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable device.