diff --git a/.github/workflows/build-installer.yml b/.github/workflows/build-installer.yml
index 6c4104e..ee8a53d 100644
--- a/.github/workflows/build-installer.yml
+++ b/.github/workflows/build-installer.yml
@@ -19,14 +19,9 @@ jobs:
         uses: actions/download-artifact@v3
         with:
           name: dyn2py.exe
-      - name: Update version number
+      - name: Build
         run: |
-          $regex = Select-String -Path pyproject.toml -Pattern '^version = "((?:\d\.){2}\d)"$'
-          $version = $regex.Matches.Groups[1].Value
-          (Get-Content dyn2py-installer.iss).Replace("x.x.x",$version) | Set-Content dyn2py-installer.iss
-      - name: Build installer
-        run: |
-          & "C:\Program Files (x86)\Inno Setup 6\ISCC.exe" -Qp $(Join-Path $PWD.Path dyn2py-installer.iss)
+          .\dyn2py-installer.ps1
       - uses: actions/upload-artifact@v3
         name: Upload artifact
         with:
diff --git a/README.md b/README.md
index c167cce..8c28521 100644
--- a/README.md
+++ b/README.md
@@ -181,17 +181,9 @@ pyinstaller dyn2py.spec
 ### Create installer for Windows
 
 - Install Inno Setup: https://jrsoftware.org/isdl.php
-- The already built exe should be in the root folder
-- Run this in powershell:
+- Build an exe
+- Run `dyn2py-installer.ps1` in powershell
 
-```powershell
-# Read version number from pyproject.toml and update in innosetup:
-$regex = Select-String -Path pyproject.toml -Pattern '^version = "((?:\d\.){2}\d)"$'
-$version = $regex.Matches.Groups[1].Value
-(Get-Content dyn2py-installer.iss).Replace("x.x.x",$version) | Set-Content dyn2py-installer.iss
-# Build:
-& "C:\Program Files (x86)\Inno Setup 6\ISCC.exe" -Qp $(Join-Path $PWD.Path dyn2py-installer.iss)
-```
 ### Live module documentation
 
 ```
diff --git a/dyn2py-installer.ps1 b/dyn2py-installer.ps1
new file mode 100644
index 0000000..d22078d
--- /dev/null
+++ b/dyn2py-installer.ps1
@@ -0,0 +1,24 @@
+$InnoSetupPath = "C:\Program Files (x86)\Inno Setup 6\ISCC.exe"
+
+# Check if innosetup installed
+if (-not (Test-Path -Path $InnoSetupPath -PathType Leaf)) {
+    throw "Innosetup not found!"    
+} 
+
+# Copy dyn2py.exe from default folder:
+if (Test-Path -Path ".\dist\dyn2py.exe" -PathType Leaf) {
+    Copy-Item ".\dist\dyn2py.exe" -Destination "." -Force
+} 
+
+# Check if dyn2py.exe exists at all
+if (-not(Test-Path -Path ".\dist\dyn2py.exe" -PathType Leaf)) {
+    throw "dyn2py.exe not found!"    
+}
+
+# Read version number from pyproject.toml and update in innosetup:
+$regex = Select-String -Path pyproject.toml -Pattern '^version = "((?:\d\.){2}\d)"$'
+$version = $regex.Matches.Groups[1].Value
+(Get-Content dyn2py-installer.iss).Replace("x.x.x", $version) | Set-Content dyn2py-installer.iss
+
+# Build:
+& $InnoSetupPath -Qp $(Join-Path $PWD.Path dyn2py-installer.iss)