diff --git a/install_sdrplay_universal.sh b/install_sdrplay_universal.sh
index 8b771b9..d1eafca 100755
--- a/install_sdrplay_universal.sh
+++ b/install_sdrplay_universal.sh
@@ -11,23 +11,30 @@ set -Eeuo pipefail
 # CONFIG
 #######################################
 
-SDRCONNECT_GITBUILD="a4b8da76b"
-RIGCONTROL_GITBUILD="4a50e06"
+# Build hashes are resolved at runtime from the upstream installer
+# (https://www.sdrplay.com/software/install.sh). The values below are used
+# as fallbacks if upstream is unreachable, and are also honoured as user
+# overrides when set in the environment before invocation.
+_SDRCONNECT_GITBUILD_USER_SET="${SDRCONNECT_GITBUILD+set}"
+_RIGCONTROL_GITBUILD_USER_SET="${RIGCONTROL_GITBUILD+set}"
+: "${SDRCONNECT_GITBUILD:=a4b8da76b}"
+: "${RIGCONTROL_GITBUILD:=4a50e06}"
+
+UPSTREAM_INSTALLER_URL="https://www.sdrplay.com/software/install.sh"
 
 SDRCONNECT_DIR="/opt/sdrconnect"
 RIGCONTROL_DIR="/opt/rigcontrol"
 
-SDRCONNECT_TAR_X86_64="sdrconnect_linux-x64_${SDRCONNECT_GITBUILD}.tar.gz"
-SDRCONNECT_TAR_ARM64="sdrconnect_linux-arm64_${SDRCONNECT_GITBUILD}.tar.gz"
-
-RIGCONTROL_TAR_X86_64="rigcontrol_linux-x64_${RIGCONTROL_GITBUILD}.tar.gz"
-RIGCONTROL_TAR_ARM64="rigcontrol_linux-arm64_${RIGCONTROL_GITBUILD}.tar.gz"
-
-SDRCONNECT_URL_X86_64="https://www.sdrplay.com/software/${SDRCONNECT_TAR_X86_64}"
-SDRCONNECT_URL_ARM64="https://www.sdrplay.com/software/${SDRCONNECT_TAR_ARM64}"
-
-RIGCONTROL_URL_X86_64="https://www.sdrplay.com/software/${RIGCONTROL_TAR_X86_64}"
-RIGCONTROL_URL_ARM64="https://www.sdrplay.com/software/${RIGCONTROL_TAR_ARM64}"
+# Artifact filenames and URLs depend on the resolved build hashes and are
+# populated by resolve_artifacts() after fetch_gitbuilds() runs.
+SDRCONNECT_TAR_X86_64=""
+SDRCONNECT_TAR_ARM64=""
+RIGCONTROL_TAR_X86_64=""
+RIGCONTROL_TAR_ARM64=""
+SDRCONNECT_URL_X86_64=""
+SDRCONNECT_URL_ARM64=""
+RIGCONTROL_URL_X86_64=""
+RIGCONTROL_URL_ARM64=""
 
 PROFILE_SCRIPT="/etc/profile.d/sdrconnect.sh"
 UDEV_RULES="/etc/udev/rules.d/66-sdrplay.rules"
@@ -312,6 +319,60 @@ show_license() {
     esac
 }
 
+#######################################
+# VERSION RESOLUTION
+#######################################
+fetch_gitbuilds(){
+    if [[ "${DONOTDOWNLOAD:-0}" == "1" ]]; then
+        info "DONOTDOWNLOAD=1: skipping upstream version lookup"
+        return
+    fi
+    if [[ "$DRY_RUN" -eq 1 ]]; then
+        info "[DRY-RUN] would fetch $UPSTREAM_INSTALLER_URL for current build hashes"
+        return
+    fi
+
+    info "Fetching current build hashes from upstream..."
+    local upstream
+    if ! upstream=$(curl -fsSL --retry 2 "$UPSTREAM_INSTALLER_URL" 2>/dev/null); then
+        warn "Could not fetch $UPSTREAM_INSTALLER_URL; using built-in fallback hashes"
+        return
+    fi
+
+    local up_sdrc up_rig
+    up_sdrc=$(grep -E '^SDRCONNECT_GITBUILD=' <<<"$upstream" | head -1 | cut -d'"' -f2)
+    up_rig=$(grep -E '^RIGCONTROL_GITBUILD='   <<<"$upstream" | head -1 | cut -d'"' -f2)
+
+    if [[ "$_SDRCONNECT_GITBUILD_USER_SET" == "set" ]]; then
+        info "Honouring SDRCONNECT_GITBUILD override: $SDRCONNECT_GITBUILD"
+    elif [[ -n "$up_sdrc" ]]; then
+        SDRCONNECT_GITBUILD="$up_sdrc"
+    else
+        warn "Could not parse SDRCONNECT_GITBUILD from upstream; using fallback $SDRCONNECT_GITBUILD"
+    fi
+
+    if [[ "$_RIGCONTROL_GITBUILD_USER_SET" == "set" ]]; then
+        info "Honouring RIGCONTROL_GITBUILD override: $RIGCONTROL_GITBUILD"
+    elif [[ -n "$up_rig" ]]; then
+        RIGCONTROL_GITBUILD="$up_rig"
+    else
+        warn "Could not parse RIGCONTROL_GITBUILD from upstream; using fallback $RIGCONTROL_GITBUILD"
+    fi
+
+    info "Resolved SDRconnect=$SDRCONNECT_GITBUILD, RigControl=$RIGCONTROL_GITBUILD"
+}
+
+resolve_artifacts(){
+    SDRCONNECT_TAR_X86_64="sdrconnect_linux-x64_${SDRCONNECT_GITBUILD}.tar.gz"
+    SDRCONNECT_TAR_ARM64="sdrconnect_linux-arm64_${SDRCONNECT_GITBUILD}.tar.gz"
+    RIGCONTROL_TAR_X86_64="rigcontrol_linux-x64_${RIGCONTROL_GITBUILD}.tar.gz"
+    RIGCONTROL_TAR_ARM64="rigcontrol_linux-arm64_${RIGCONTROL_GITBUILD}.tar.gz"
+    SDRCONNECT_URL_X86_64="https://www.sdrplay.com/software/${SDRCONNECT_TAR_X86_64}"
+    SDRCONNECT_URL_ARM64="https://www.sdrplay.com/software/${SDRCONNECT_TAR_ARM64}"
+    RIGCONTROL_URL_X86_64="https://www.sdrplay.com/software/${RIGCONTROL_TAR_X86_64}"
+    RIGCONTROL_URL_ARM64="https://www.sdrplay.com/software/${RIGCONTROL_TAR_ARM64}"
+}
+
 #######################################
 # DOWNLOAD
 #######################################
@@ -576,6 +637,9 @@ main(){
     check_dependencies
     ensure_sudo
 
+    fetch_gitbuilds
+    resolve_artifacts
+
     [[ "$ARCH" == "x86_64" ]] && {
         U1="$SDRCONNECT_URL_X86_64"; U2="$RIGCONTROL_URL_X86_64"
         F1="$SDRCONNECT_TAR_X86_64"; F2="$RIGCONTROL_TAR_X86_64"