diff --git a/CHANGELOG.md b/CHANGELOG.md
index 979849b008..c353684138 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,22 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](https://semver.org/).
 
+## [5.4.3.0] 2023-04-05, leisure
+
+### Added
+ - install: Enhance windows installer - detect running gridcoinresearch(d).exe and ask to close before continuing #2672 (@jamescowens)
+ - gui: Add one minute QTimer to update beacon age/expiration in tooltip #2671 (@jamescowens)
+
+### Changed
+none
+
+### Removed
+none
+
+### Fixed
+ - util: Implement workaround for backupwallet to deal with Boost 1.74 regression on copy_file #2669 (@jamescowens)
+ - banman: use GetPerformanceCounter instead of GetRandBytes #2668 (@div72)
+
 ## [5.4.2.0] 2023-03-26, leisure, "LaVerne"
 
 ### Added
diff --git a/configure.ac b/configure.ac
index a91254db1a..5b123885ca 100755
--- a/configure.ac
+++ b/configure.ac
@@ -2,10 +2,10 @@ dnl require autoconf 2.60 (AS_ECHO/AS_ECHO_N)
 AC_PREREQ([2.60])
 define(_CLIENT_VERSION_MAJOR, 5)
 define(_CLIENT_VERSION_MINOR, 4)
-define(_CLIENT_VERSION_REVISION, 2)
+define(_CLIENT_VERSION_REVISION, 3)
 define(_CLIENT_VERSION_BUILD, 0)
 define(_CLIENT_VERSION_IS_RELEASE, true)
-define(_COPYRIGHT_YEAR, 2022)
+define(_COPYRIGHT_YEAR, 2023)
 define(_COPYRIGHT_HOLDERS,[The %s developers])
 define(_COPYRIGHT_HOLDERS_SUBSTITUTION,[[Gridcoin]])
 AC_INIT([Gridcoin],[_CLIENT_VERSION_MAJOR._CLIENT_VERSION_MINOR._CLIENT_VERSION_REVISION],[https://github.com/gridcoin/Gridcoin-Research/issues],[gridcoin],[https://gridcoin.us/])
diff --git a/share/setup.nsi.in b/share/setup.nsi.in
index eef98f6810..a3f070dfca 100644
--- a/share/setup.nsi.in
+++ b/share/setup.nsi.in
@@ -168,6 +168,16 @@ Function .onInit
       Abort
     ${EndIf}
 !endif
+    loop:
+    ExpandEnvStrings $1 "%COMSPEC%"
+    ExecWait '$1 /C "$\"$SYSDIR\tasklist.exe$\" /NH /FI $\"IMAGENAME eq @GRIDCOIN_GUI_NAME@@EXEEXT@$\" | $\"$SYSDIR\find.exe$\" /I $\"@GRIDCOIN_GUI_NAME@@EXEEXT@$\""' $0
+    StrCmp $0 0 0 notRunning_gui
+    MessageBox MB_OKCANCEL|MB_ICONEXCLAMATION 'The Gridcoin wallet (@GRIDCOIN_GUI_NAME@@EXEEXT@) is running. Please close before continuing.' IDOK loop IDCANCEL end
+    notRunning_gui:
+    ExecWait '$1 /C "$\"$SYSDIR\tasklist.exe$\" /NH /FI $\"IMAGENAME eq @GRIDCOIN_DAEMON_NAME@@EXEEXT@$\" | $\"$SYSDIR\find.exe$\" /I $\"@GRIDCOIN_DAEMON_NAME@@EXEEXT@$\""' $0
+    StrCmp $0 0 0 notRunning_daemon
+    MessageBox MB_OKCANCEL|MB_ICONEXCLAMATION 'The Gridcoin wallet daemon (@GRIDCOIN_DAEMON_NAME@@EXEEXT@) is running. Please close before continuing.' IDOK loop IDCANCEL end
+    notRunning_daemon:
     ; Check for HKCU Path registry and prompt for uninstallation if found
     ReadRegStr $0 HKCU "${REGKEY}" "Path"
     ${IfThen} $0 == "" ${|} Return ${|}
@@ -184,6 +194,8 @@ Function .onInit
     ${EndIf}
     ExecWait "$1 _?=$0" $0
     ${IfThen} $0 != 0 ${|} Abort ${|}
+    end:
+    Abort
 FunctionEnd
 
 # Uninstaller functions
diff --git a/src/addrdb.cpp b/src/addrdb.cpp
index c40d55a17c..c16078c41a 100644
--- a/src/addrdb.cpp
+++ b/src/addrdb.cpp
@@ -40,9 +40,7 @@ template <typename Data>
 bool SerializeFileDB(const std::string& prefix, const fs::path& path, const Data& data)
 {
     // Generate random temporary filename
-    unsigned short randv = 0;
-    GetRandBytes((unsigned char*)&randv, sizeof(randv));
-    std::string tmpfn = strprintf("%s.%04x", prefix, randv);
+    std::string tmpfn = strprintf("%s.%" PRIx64, prefix, GetPerformanceCounter());
 
     // open temp output file, and associate with CAutoFile
     fs::path pathTmp = GetDataDir() / tmpfn;
diff --git a/src/gridcoin/backup.cpp b/src/gridcoin/backup.cpp
index c29b12d1db..de5456fb26 100644
--- a/src/gridcoin/backup.cpp
+++ b/src/gridcoin/backup.cpp
@@ -8,6 +8,7 @@
 #include "wallet/wallet.h"
 #include "util.h"
 #include "util/time.h"
+#include <filesystem>
 
 #include <boost/date_time/posix_time/posix_time.hpp>
 
@@ -117,11 +118,16 @@ bool GRC::BackupConfigFile(const std::string& strDest)
     fs::create_directories(ConfigTarget.parent_path());
     try
     {
-        #if BOOST_VERSION >= 107400
-            fs::copy_file(ConfigSource, ConfigTarget, fs::copy_options::overwrite_existing);
-        #else
-            fs::copy_file(ConfigSource, ConfigTarget, fs::copy_option::overwrite_if_exists);
-        #endif
+#if BOOST_VERSION > 107400
+        fs::copy_file(ConfigSource, ConfigTarget, fs::copy_options::overwrite_existing);
+#elif BOOST_VERSION == 107400
+        // This is a workaround for Boost 1.74's problem with copy_file when the target is inside a symlink.
+        std::filesystem::path StdConfigSource = ConfigSource.wstring();
+        std::filesystem::path StdConfigTarget = strDest;
+        std::filesystem::copy_file(StdConfigSource, StdConfigTarget, std::filesystem::copy_options::overwrite_existing);
+#else
+        fs::copy_file(ConfigSource, ConfigTarget, fs::copy_option::overwrite_if_exists);
+#endif
         LogPrintf("BackupConfigFile: Copied gridcoinresearch.conf to %s", ConfigTarget.string());
         return true;
     }
@@ -156,8 +162,13 @@ bool GRC::BackupWallet(const CWallet& wallet, const std::string& strDest)
             WalletTarget /= wallet.strWalletFile;
         try
         {
-#if BOOST_VERSION >= 107400
+#if BOOST_VERSION > 107400
             fs::copy_file(WalletSource, WalletTarget, fs::copy_options::overwrite_existing);
+#elif BOOST_VERSION == 107400
+            // This is a workaround for Boost 1.74's problem with copy_file when the target is inside a symlink.
+            std::filesystem::path StdWalletSource = WalletSource.wstring();
+            std::filesystem::path StdWalletTarget = strDest;
+            std::filesystem::copy_file(StdWalletSource, StdWalletTarget, std::filesystem::copy_options::overwrite_existing);
 #else
             fs::copy_file(WalletSource, WalletTarget, fs::copy_option::overwrite_if_exists);
 #endif
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 7a382f855d..becaeb4abd 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -828,6 +828,15 @@ void BitcoinGUI::setResearcherModel(ResearcherModel *researcherModel)
 
     updateBeaconIcon();
     connect(researcherModel, &ResearcherModel::beaconChanged, this, &BitcoinGUI::updateBeaconIcon);
+
+    QTimer *beacon_status_update_timer = new QTimer(this);
+
+    // This timer trigger is to support updating the beacon age and time to expiration in the tooltip.
+    // Once a minute is sufficient.
+    connect(beacon_status_update_timer, &QTimer::timeout, this, &BitcoinGUI::updateBeaconIcon);
+
+    // Check every minute
+    beacon_status_update_timer->start(1000 * 60);
 }
 
 void BitcoinGUI::setMRCModel(MRCModel *mrcModel)