SRX300 Can't upgrade software to 17.3R1

Hi,

I downloaded the 17.3R1 software from juniper web site. But when I try to upload it from Jweb, It shows the following error : 

The software package () was not a Junos package.

Installation of the package () is not supported.

My current version is 15.1X49-D100.6.

Is this version 17.3R1 support SRX300 ?  Or is there another way to upgrade it ?

One more question,

Is 17.3R1 support client to site VPN server ? Like using smartphone to connect it by ipsec VPN?

Because I set up dynamic VPN now but it can't connect by my iPhone.

Thanks.