diff --git a/src/server.h b/src/server.h
index 70c8cd8f..a9f3f94d 100644
--- a/src/server.h
+++ b/src/server.h
@@ -128,6 +128,9 @@ typedef struct
 
 	entity_state_t static_entities[512];
 	int            static_entity_count;
+#ifdef FTE_PEXT_CSQC
+	unsigned int   csqcchecksum;
+#endif
 } server_t;
 
 #define	NUM_SPAWN_PARMS 16
diff --git a/src/sv_init.c b/src/sv_init.c
index 806b11c6..d18f47f8 100644
--- a/src/sv_init.c
+++ b/src/sv_init.c
@@ -196,6 +196,33 @@ static unsigned SV_CheckModel(char *mdl)
 	return crc;
 }
 
+#ifdef FTE_PEXT_CSQC
+static void SV_LoadCSQC(void)
+{
+	extern cvar_t sv_csqc_progname;
+	int size;
+
+	byte *file = FS_LoadTempFile(sv_csqc_progname.string, &size);
+	if (file)
+	{
+		char text[64];
+		sv.csqcchecksum = Com_BlockChecksum(file, size);
+		sprintf(text, "0x%x", sv.csqcchecksum);
+		Info_SetValueForStarKey(svs.info, "*csprogs", text, MAX_SERVERINFO_STRING);
+		sprintf(text, "0x%x", (unsigned int)size);
+		Info_SetValueForStarKey(svs.info, "*csprogssize", text, MAX_SERVERINFO_STRING);
+		Info_SetValueForStarKey(svs.info, "*csprogsname", sv_csqc_progname.string, MAX_SERVERINFO_STRING);
+	}
+	else
+	{
+		sv.csqcchecksum = 0;
+		Info_SetValueForStarKey(svs.info, "*csprogs", "", MAX_SERVERINFO_STRING);
+		Info_SetValueForStarKey(svs.info, "*csprogssize", "", MAX_SERVERINFO_STRING);
+		Info_SetValueForStarKey(svs.info, "*csprogsname", "", MAX_SERVERINFO_STRING);
+	}
+}
+#endif
+
 /*
 ================
 SV_SpawnServer
@@ -339,6 +366,10 @@ void SV_SpawnServer(char *mapname, qbool devmap, char* entityfile, qbool loading
 
 	sv.time = 1.0;
 
+#ifdef FTE_PEXT_CSQC
+	SV_LoadCSQC();
+#endif
+
 	// load progs to get entity field count
 	// which determines how big each edict is
 	// and allocate edicts
diff --git a/src/sv_main.c b/src/sv_main.c
index 97935baf..171c73eb 100644
--- a/src/sv_main.c
+++ b/src/sv_main.c
@@ -194,6 +194,10 @@ cvar_t sv_pext_mvdsv_serversideweapon = { "sv_pext_mvdsv_serversideweapon", "1"
 
 cvar_t sv_extlimits = { "sv_extlimits", "2" };
 
+#ifdef FTE_PEXT_CSQC
+cvar_t sv_csqc_progname = { "sv_csqc_progname", "csprogs.dat" };
+#endif
+
 qbool sv_error = false;
 
 client_t *WatcherId = NULL; // QW262
@@ -3529,6 +3533,10 @@ void SV_InitLocal (void)
 
 	Cvar_Register(&sv_mod_extensions);
 
+#ifdef FTE_PEXT_CSQC
+	Cvar_Register (&sv_csqc_progname);
+#endif
+
 // QW262 -->
 	Cmd_AddCommand ("svadmin", SV_Admin_f);
 // <-- QW262
diff --git a/src/sv_user.c b/src/sv_user.c
index 71f6d70d..511f0509 100644
--- a/src/sv_user.c
+++ b/src/sv_user.c
@@ -318,6 +318,17 @@ static void Cmd_New_f (void)
 	if (!gamedir[0])
 		gamedir = "qw";
 
+#ifdef FTE_PEXT_CSQC
+	if (sv.csqcchecksum && !(sv_client->fteprotocolextensions & FTE_PEXT_CSQC))
+	{
+		SV_ClientPrintf(sv_client, PRINT_HIGH, "\n\n\n\n"
+			"This server is using CSQC - you are missing out due to your choice of outdated client / protocol!\n"
+			"Please upgrade to one of the following:\n"
+			"> ezQuake (https://www.ezquake.com) (hardcoded KTX support)\n"
+			"> FTEQW (http://fte.triptohell.info/)\n");
+	}
+#endif
+
 #ifdef FTE_PEXT_FLOATCOORDS
 	if (msg_coordsize > 2 && !(sv_client->fteprotocolextensions & FTE_PEXT_FLOATCOORDS))
 	{
@@ -1416,10 +1427,14 @@ static void Cmd_Download_f(void)
 
 	if (sv_client->special)
 		allow_dl = true; // NOTE: user used techlogin, allow dl anything in quake dir in such case!
-	else if (!strstr(name, "/"))
-		allow_dl = false; // should be in subdir
 	else if (!(int)allow_download.value)
 		allow_dl = false; // global allow check
+#ifdef FTE_PEXT_CSQC
+	else if (!strncmp(name, "csprogs.dat", 11))
+		allow_dl = true; // we always allow csprogs.dat to be downloaded (if downloads are permitted).
+#endif
+	else if (!strstr(name, "/"))
+		allow_dl = false; // should be in subdir
 	else if (!strncmp(name, "skins/", 6))
 		allow_dl = allow_download_skins.value; // skins
 	else if (!strncmp(name, "progs/", 6))