The easiest way to download and host a dedicated Necesse server is through Steam.
You can find a how to on the official wiki page.
You can also download the server files directly here:
Windows64 - v1.2.0 build 23522718
MacOS - v1.2.0 build 23522718
Linux64 - v1.2.0 build 23522718
Older versions:
Windows64 - v1.1.1 build 21292486
MacOS - v1.1.1 build 21292486
Linux64 - v1.1.1 build 21292486
Windows64 - v1.1 build 21248051
MacOS - v1.1 build 21248051
Linux64 - v1.1 build 21248051
Windows64 - v1.0.3 build 20875636
MacOS - v1.0.3 build 20875636
Linux64 - v1.0.3 build 20875636
Windows64 - v1.0.2 build 20750801
MacOS - v1.0.2 build 20750801
Linux64 - v1.0.2 build 20750801
Windows64 - v1.0.1 build 20510020
MacOS - v1.0.1 build 20510020
Linux64 - v1.0.1 build 20510020
Windows64 - v0.33.1 build 19314669
MacOS - v0.33.1 build 19314669
Linux64 - v0.33.1 build 19314669
Windows64 - v0.33.0 build 19217581
MacOS - v0.33.0 build 19217581
Linux64 - v0.33.0 build 19217581
Windows64 - v0.32.1 build 18336931
MacOS - v0.32.1 build 18336931
Linux64 - v0.32.1 build 18336931
Windows64 - v0.32.0 build 18084181
MacOS - v0.32.0 build 18084181
Linux64 - v0.32.0 build 18084181
Windows64 - v0.31.1 build 17664948
MacOS - v0.31.1 build 17664948
Linux64 - v0.31.1 build 17664948
Windows64 - v0.31.0 build 17609908
MacOS - v0.31.0 build 17609908
Linux64 - v0.31.0 build 17609908
Windows64 - v0.30.0 build 17129871
MacOS - v0.30.0 build 17129871
Linux64 - v0.30.0 build 17129871
Windows64 - v0.29.0 build 16890887
MacOS - v0.29.0 build 16890887
Linux64 - v0.29.0 build 16890887
Windows64 - v0.28.1 build 16550819
MacOS - v0.28.1 build 16550819
Linux64 - v0.28.1 build 16550819
Windows64 - v0.28.0 build 16270030
MacOS - v0.28.0 build 16270030
Linux64 - v0.28.0 build 16270030
Windows64 - v0.27.0 build 15916337
MacOS - v0.27.0 build 15916337
Linux64 - v0.27.0 build 15916337
Windows64 - v0.26.1 build 15505647
MacOS - v0.26.1 build 15505647
Linux64 - v0.26.1 build 15505647
Windows64 - v0.26.0 build 15369537
MacOS - v0.26.0 build 15369537
Linux64 - v0.26.0 build 15369537
Windows64 - v0.25.1 build 14758302
Windows32 - v0.25.1 build 14758302
MacOS - v0.25.1 build 14758302
Linux64 - v0.25.1 build 14758302
Windows64 - v0.25.0 build 14530827
Windows32 - v0.25.0 build 14530827
MacOS - v0.25.0 build 14530827
Linux64 - v0.25.0 build 14530827