diff --git a/install_all.sh b/install_all.sh
index eef0613..8406649 100755
--- a/install_all.sh
+++ b/install_all.sh
@@ -7,6 +7,10 @@ SYSTEMD_TARGET_DIR="/etc/systemd/system"
 RUN_USER="${SUDO_USER:-${USER}}"
 RUN_GROUP="$(id -gn "${RUN_USER}")"
 
+SOURCE_ARCHIVES=(
+  "torchsig.tar.gz:torchsig:pyproject.toml"
+)
+
 SDR_UNITS=(
   dronedetector-sdr-433.service
   dronedetector-sdr-750.service
@@ -59,6 +63,35 @@ require_root() {
   fi
 }
 
+extract_local_source_archives() {
+  local spec archive_rel target_rel sentinel_rel
+  local archive_path target_path sentinel_path
+
+  for spec in "${SOURCE_ARCHIVES[@]}"; do
+    IFS=':' read -r archive_rel target_rel sentinel_rel <<< "$spec"
+    archive_path="${PROJECT_ROOT}/${archive_rel}"
+    target_path="${PROJECT_ROOT}/${target_rel}"
+    sentinel_path="${target_path}/${sentinel_rel}"
+
+    if [[ -f "${sentinel_path}" ]]; then
+      log "Vendored source already available: ${target_rel}"
+      continue
+    fi
+
+    if [[ -e "${target_path}" ]]; then
+      die "Found ${target_path}, but ${sentinel_rel} is missing. Remove or repair this directory, then rerun the installer."
+    fi
+
+    [[ -f "${archive_path}" ]] || die "Missing vendored source ${target_path} and archive ${archive_path}"
+    command -v tar >/dev/null 2>&1 || die "tar is required to unpack ${archive_rel}"
+
+    log "Extracting ${archive_rel} -> ${target_rel}"
+    tar -xzf "${archive_path}" -C "${PROJECT_ROOT}"
+    [[ -f "${sentinel_path}" ]] || die "Archive ${archive_path} did not unpack expected file ${sentinel_path}"
+    chown -R "${RUN_USER}:${RUN_GROUP}" "${target_path}"
+  done
+}
+
 preflight() {
   log "Preflight checks"
   [[ -f "${PROJECT_ROOT}/.env" ]] || die "Missing ${PROJECT_ROOT}/.env"
@@ -233,6 +266,7 @@ main() {
   log "Project root: ${PROJECT_ROOT}"
   log "Runtime user: ${RUN_USER}:${RUN_GROUP}"
 
+  extract_local_source_archives
   preflight
   install_host_non_python_deps
   setup_sdr_python_env