diff --git a/src/check.sh b/src/check.sh
index 4e964671..5e72f981 100644
--- a/src/check.sh
+++ b/src/check.sh
@@ -4,13 +4,13 @@ set -Eeuo pipefail
 : "${NETWORK:="Y"}"
 
 [ -f "/run/shm/qemu.end" ] && echo "QEMU is shutting down.." && exit 1
-[ ! -f "/run/shm/qemu.pid" ] && echo "QEMU is not running yet.." && exit 0
+[ ! -s "/run/shm/qemu.pid" ] && echo "QEMU is not running yet.." && exit 0
 [[ "$NETWORK" != [Yy1]* ]] && echo "Networking is disabled.." && exit 0
 
 file="/run/shm/dsm.url"
 address="/run/shm/qemu.ip"
 
-[ ! -f  "$file" ] && echo "DSM has not enabled networking yet.." && exit 1
+[ ! -s  "$file" ] && echo "DSM has not enabled networking yet.." && exit 1
 
 location=$(<"$file")
 
diff --git a/src/disk.sh b/src/disk.sh
index 7bf4a9dd..83f6fadf 100644
--- a/src/disk.sh
+++ b/src/disk.sh
@@ -13,8 +13,8 @@ set -Eeuo pipefail
 BOOT="$STORAGE/$BASE.boot.img"
 SYSTEM="$STORAGE/$BASE.system.img"
 
-[ ! -f "$BOOT" ] && error "Virtual DSM boot-image does not exist ($BOOT)" && exit 81
-[ ! -f "$SYSTEM" ] && error "Virtual DSM system-image does not exist ($SYSTEM)" && exit 82
+[ ! -s "$BOOT" ] && error "Virtual DSM boot-image does not exist ($BOOT)" && exit 81
+[ ! -s "$SYSTEM" ] && error "Virtual DSM system-image does not exist ($SYSTEM)" && exit 82
 
 DISK_OPTS="\
     -object iothread,id=io2 \
@@ -386,7 +386,7 @@ addDisk () {
   FS=$(stat -f -c %T "$DIR")
   checkFS "$FS" "$DISK_FILE" "$DISK_DESC" || exit $?
 
-  if ! [ -f "$DISK_FILE" ] ; then
+  if ! [ -s "$DISK_FILE" ] ; then
 
     if [[ "${DISK_FMT,,}" != "raw" ]]; then
       PREV_FMT="raw"
@@ -395,12 +395,12 @@ addDisk () {
     fi
     PREV_EXT=$(fmt2ext "$PREV_FMT")
 
-    if [ -f "$DISK_BASE.$PREV_EXT" ] ; then
+    if [ -s "$DISK_BASE.$PREV_EXT" ] ; then
       convertDisk "$DISK_BASE.$PREV_EXT" "$PREV_FMT" "$DISK_FILE" "$DISK_FMT" "$DISK_BASE" "$DISK_DESC" "$FS" || exit $?
     fi
   fi
 
-  if [ -f "$DISK_FILE" ]; then
+  if [ -s "$DISK_FILE" ]; then
 
     CUR_SIZE=$(getSize "$DISK_FILE")
 
diff --git a/src/install.sh b/src/install.sh
index 5afa5567..a612adcd 100644
--- a/src/install.sh
+++ b/src/install.sh
@@ -5,6 +5,7 @@ set -Eeuo pipefail
 
 if [ -f "$STORAGE/dsm.ver" ]; then
   BASE=$(<"$STORAGE/dsm.ver")
+  [ -z "$BASE" ] && BASE="DSM_VirtualDSM_69057"
 else
   # Fallback for old installs
   BASE="DSM_VirtualDSM_42962"
@@ -12,14 +13,14 @@ fi
 
 if [ -n "$URL" ]; then
   BASE=$(basename "$URL" .pat)
-  if [ ! -f "$STORAGE/$BASE.system.img" ]; then
+  if [ ! -s "$STORAGE/$BASE.system.img" ]; then
     BASE=$(basename "${URL%%\?*}" .pat)
     : "${BASE//+/ }"; printf -v BASE '%b' "${_//%/\\x}"
     BASE=$(echo "$BASE" | sed -e 's/[^A-Za-z0-9._-]/_/g')
   fi
 fi
 
-if [[ -f "$STORAGE/$BASE.boot.img" ]] && [[ -f "$STORAGE/$BASE.system.img" ]]; then
+if [[ -s "$STORAGE/$BASE.boot.img" ]] && [[ -s "$STORAGE/$BASE.system.img" ]]; then
   return 0  # Previous installation found
 fi
 
@@ -106,7 +107,7 @@ fi
 ROOT="Y"
 RDC="$STORAGE/dsm.rd"
 
-if [ ! -f "$RDC" ]; then
+if [ ! -s "$RDC" ]; then
 
   MSG="Downloading installer..."
   PRG="Downloading installer ([P])..."
@@ -118,6 +119,7 @@ if [ ! -f "$RDC" ]; then
   LOC="$DL/release/7.0.1/42218/DSM_VirtualDSM_42218.pat"
 
   rm -f "$RD"
+  rm -f "$RDC"
   /run/progress.sh "$RD" "$PRG" &
   { curl -r "$POS" -sfk -S -o "$RD" "$LOC"; rc=$?; } || :
 
@@ -215,7 +217,7 @@ else
 
 fi
 
-[ ! -f "$PAT" ] && error "Failed to download $URL" && exit 69
+[ ! -s "$PAT" ] && error "Failed to download $URL" && exit 69
 
 SIZE=$(stat -c%s "$PAT")
 
@@ -252,7 +254,7 @@ MSG="Preparing system partition..."
 info "Install: $MSG" && html "$MSG"
 
 BOOT=$(find "$TMP" -name "*.bin.zip")
-[ ! -f "$BOOT" ] && error "The PAT file contains no boot image." && exit 67
+[ ! -s "$BOOT" ] && error "The PAT file contains no boot image." && exit 67
 
 BOOT=$(echo "$BOOT" | head -c -5)
 unzip -q -o "$BOOT".zip -d "$TMP"
@@ -313,15 +315,15 @@ IDB="$TMP/indexdb"
 PKG="$TMP/packages"
 HDP="$TMP/synohdpack_img"
 
-[ ! -f "$HDA.tgz" ] && error "The PAT file contains no OS image." && exit 64
+[ ! -s "$HDA.tgz" ] && error "The PAT file contains no OS image." && exit 64
 mv "$HDA.tgz" "$HDA.txz"
 
 [ -d "$PKG" ] && mv "$PKG/" "$MOUNT/.SynoUpgradePackages/"
 rm -f "$MOUNT/.SynoUpgradePackages/ActiveInsight-"*
 
-[ -f "$HDP.txz" ] && tar xpfJ "$HDP.txz" --absolute-names -C "$MOUNT/"
+[ -s "$HDP.txz" ] && tar xpfJ "$HDP.txz" --absolute-names -C "$MOUNT/"
 
-if [ -f "$IDB.txz" ]; then
+if [ -s "$IDB.txz" ]; then
   INDEX_DB="$MOUNT/usr/syno/synoman/indexdb/"
   mkdir -p "$INDEX_DB"
   tar xpfJ "$IDB.txz" --absolute-names -C "$INDEX_DB"
diff --git a/src/network.sh b/src/network.sh
index f1a71c24..f053e94c 100644
--- a/src/network.sh
+++ b/src/network.sh
@@ -200,7 +200,7 @@ closeNetwork() {
   else
 
     local pid="/var/run/dnsmasq.pid"
-    [ -f "$pid" ] && pKill "$(<"$pid")"
+    [ -s "$pid" ] && pKill "$(<"$pid")"
 
     ip link set "$VM_NET_TAP" down promisc off || true
     ip link delete "$VM_NET_TAP" || true
@@ -228,7 +228,7 @@ getInfo() {
 
   if [ -z "$VM_NET_MAC" ]; then
     local file="$STORAGE/dsm.mac"
-    [ -f "$file" ] && VM_NET_MAC=$(<"$file")
+    [ -s "$file" ] && VM_NET_MAC=$(<"$file")
     if [ -z "$VM_NET_MAC" ]; then
       # Generate MAC address based on Docker container ID in hostname
       VM_NET_MAC=$(echo "$HOST" | md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:11:32:\3:\4:\5/')
diff --git a/src/power.sh b/src/power.sh
index 678895ff..99079798 100644
--- a/src/power.sh
+++ b/src/power.sh
@@ -36,7 +36,7 @@ finish() {
 
   touch "$QEMU_END"
 
-  if [ -f "$QEMU_PID" ]; then
+  if [ -s "$QEMU_PID" ]; then
 
     pid=$(<"$QEMU_PID")
     echo && error "Forcefully terminating QEMU process, reason: $reason..."
@@ -45,7 +45,7 @@ finish() {
     while isAlive "$pid"; do
       sleep 1
       # Workaround for zombie pid
-      [ ! -f "$QEMU_PID" ] && break
+      [ ! -s "$QEMU_PID" ] && break
     done
   fi
 
@@ -64,7 +64,7 @@ terminal() {
 
   local dev=""
 
-  if [ -f "$QEMU_OUT" ]; then
+  if [ -s "$QEMU_OUT" ]; then
 
     local msg
     msg=$(<"$QEMU_OUT")
@@ -113,7 +113,7 @@ _graceful_shutdown() {
   touch "$QEMU_END"
   echo && info "Received $1 signal, sending shutdown command..."
 
-  if [ ! -f "$QEMU_PID" ]; then
+  if [ ! -s "$QEMU_PID" ]; then
     echo && error "QEMU PID file does not exist?"
     finish "$code" && return "$code"
   fi
@@ -157,7 +157,7 @@ _graceful_shutdown() {
     [[ "$DEBUG" == [Yy1]* ]] && info "Shutting down, waiting... ($cnt/$QEMU_TIMEOUT)"
 
     # Workaround for zombie pid
-    [ ! -f "$QEMU_PID" ] && break
+    [ ! -s "$QEMU_PID" ] && break
 
   done
 
diff --git a/src/print.sh b/src/print.sh
index 744c2b75..0d0d736b 100644
--- a/src/print.sh
+++ b/src/print.sh
@@ -21,7 +21,7 @@ resp_err="Guest returned an invalid response:"
 curl_err="Failed to connect to guest: curl error"
 jq_err="Failed to parse response from guest: jq error"
 
-while [ ! -f  "$file" ]
+while [ ! -s  "$file" ]
 do
 
   # Check if not shutting down
@@ -30,7 +30,7 @@ do
   sleep 3
 
   [ -f "$shutdown" ] && exit 1
-  [ -f "$file" ] && break
+  [ -s "$file" ] && break
 
   # Retrieve network info from guest VM
   { json=$(curl -m 20 -sk "$url"); rc=$?; } || :
diff --git a/src/progress.sh b/src/progress.sh
index 007ce57b..d32e2725 100644
--- a/src/progress.sh
+++ b/src/progress.sh
@@ -21,7 +21,7 @@ fi
 
 while true
 do
-  if [ -f "$file" ]; then
+  if [ -s "$file" ]; then
     bytes=$(du -sb "$file" | cut -f1)
     if (( bytes > 1000 )); then
       size=$(echo "$bytes" | numfmt --to=iec --suffix=B  | sed -r 's/([A-Z])/ \1/')