diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10a656b..6d2e9c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,9 +9,12 @@
 * (Improvement) GUI is now scalable
 * (Fix) Some bug found and fixed during convertion
 
-## 01/10/2020 - v0.8.4.1
+## 10/10/2020 - v0.8.4.1
 
+* (Add) Tool - Modify print parameters: Value unit to confirmation text
+* (Change) Tool - Modify print parameters: Maximum allowed exposure times from 255s to 1000s (#69)
 * (Change) On operations, instead of partial backup a whole backup is made, this allow cancel operations which changes layer count and other structure changes
+* (Improvement) PrusaSlicer profile manager: Files are now checked against checksum instead write time to prevent trigger an false update when using MSI installer
 * (Fix) Tool - Layer Import: Allow cancel operation
 * (Fix) Tool - Layer Import: When importing layers that increase the total layer count of the file program stays forever on progress
 * (Fix) Tool - Layer Clone: Layer information was the same as heights, fixed to show the result of operation in layers
diff --git a/UVtools.Core/FileFormats/FileFormat.cs b/UVtools.Core/FileFormats/FileFormat.cs
index 0bdd541..2c7780c 100644
--- a/UVtools.Core/FileFormats/FileFormat.cs
+++ b/UVtools.Core/FileFormats/FileFormat.cs
@@ -57,8 +57,8 @@ namespace UVtools.Core.FileFormats
             
             #region Instances
             public static PrintParameterModifier BottomLayerCount { get; } = new PrintParameterModifier("Bottom layer count", null, "layers",0, ushort.MaxValue, 0);
-            public static PrintParameterModifier BottomExposureSeconds { get; } = new PrintParameterModifier("Bottom exposure time", null, "s", 0.1M, byte.MaxValue, 2);
-            public static PrintParameterModifier ExposureSeconds { get; } = new PrintParameterModifier("Exposure time", null, "s", 0.1M, byte.MaxValue, 2);
+            public static PrintParameterModifier BottomExposureSeconds { get; } = new PrintParameterModifier("Bottom exposure time", null, "s", 0.1M, 1000, 2);
+            public static PrintParameterModifier ExposureSeconds { get; } = new PrintParameterModifier("Exposure time", null, "s", 0.1M, 1000, 2);
             
             public static PrintParameterModifier BottomLayerOffTime { get; } = new PrintParameterModifier("Bottom layer off seconds", null, "s");
             public static PrintParameterModifier LayerOffTime { get; } = new PrintParameterModifier("Layer off seconds", null, "s");
diff --git a/UVtools.Core/Operations/OperationEditParameters.cs b/UVtools.Core/Operations/OperationEditParameters.cs
index 968c552..8b26745 100644
--- a/UVtools.Core/Operations/OperationEditParameters.cs
+++ b/UVtools.Core/Operations/OperationEditParameters.cs
@@ -32,7 +32,7 @@ namespace UVtools.Core.Operations
                 foreach (var modifier in Modifiers)
                 {
                     if(!modifier.HasChanged) continue;
-                    sb.AppendLine($"{modifier.Name}: {modifier.OldValue} » {modifier.NewValue}");
+                    sb.AppendLine($"{modifier.Name}: {modifier.OldValue}{modifier.ValueUnit} » {modifier.NewValue}{modifier.ValueUnit}");
                 }
                 return $"commit print parameter changes?\n{sb}";
             }
diff --git a/UVtools.GUI/Forms/FrmInstallPEProfiles.cs b/UVtools.GUI/Forms/FrmInstallPEProfiles.cs
index 9b2ce81..9adfa5f 100644
--- a/UVtools.GUI/Forms/FrmInstallPEProfiles.cs
+++ b/UVtools.GUI/Forms/FrmInstallPEProfiles.cs
@@ -8,7 +8,9 @@
 using System;
 using System.Drawing;
 using System.IO;
+using System.Linq;
 using System.Windows.Forms;
+using UVtools.Core.Objects;
 
 namespace UVtools.GUI.Forms
 {
@@ -53,7 +55,8 @@ namespace UVtools.GUI.Forms
                     if (targetFileInfo.Exists)
                     {
                         installedCount++;
-                        if (targetFileInfo.Length != fileInfo.Length || targetFileInfo.LastWriteTime != fileInfo.LastWriteTime)
+                        if (targetFileInfo.Length != fileInfo.Length || !StaticObjects.GetHashSha256(targetFileInfo.FullName).SequenceEqual(StaticObjects.GetHashSha256(fileInfo.FullName)))
+                            //if (targetFileInfo.Length != fileInfo.Length || targetFileInfo.LastWriteTime != fileInfo.LastWriteTime)
                         {
                             item.ForeColor = Color.Red;
                             item.Checked = true;