1. Press Windows Key + R then type the following in the run dialog box and press Enter key on keyboard: msiexec /unreg
2. Open the run dialog box again and type msiexec /regserver and hit Enter.
3. This would re-register the Windows Installer. Reboot your PC to save changes.
Open My Computer and Go to C:\ Drive > Windows and Right Click On ‘Temp’ Folder and Select Properties.
Under Security Click on Edit.
Select Everyone or Your User Account and Allow Full Control in permissions for users and click on OK button.
MSI’s bug 25 out of 10, Windows 8.1 and Windows 7 monitors usually balance out that the C:WindowsTemp folder has incorrect NTFS permissions. In order for the Windows Installer to do this normally, the folder must have full write permissions as well as ownership of your buyer’s account.
The installer encountered an unexpected error while installing this package. This may indicate a problem with this package. The error code is 2502. The installer encountered an unexpected memory error for this package. This may indicate a functional issue with this package. Error code 2503.
If you are installing (or configuring) software on your primary PC running Windows 7, 8, or 10, you may see ERROR 2503 followed by ERROR 2502: Set C:\WINDOWS\TEMP to read and write to AUTHENTICATED USERS FULL MANAGEMENT End the task in EXPLORER.EXE and start a new one with administrator rights.
The installer encountered an unexpected error while installing this package. This may indicate a problem with the following package. Error code 2503. The installer encountered an unexpected error while getting this package. This may point to your problem with this package. HTML error code 2502. If this happens after I create modified regedit files, I think that’s awesome.
The Epic Games Launcher sometimes has installation issues, but there are many easy fixes for error 2503. Epic Games is known for its very generous weekly free games promotions. Fortnite is Epic’s most established free-to-play game.
How do you fix the installer has encountered an unexpected error installing this package error code 2503?
Fix errors and 2502 2503 during program or uninstall
How do I fix Windows installer error 2503?
Fixed errors 2502 and 2503 when accessing or deleting
How do I fix error 2503 on Minecraft installer?
Fixed errors 2502 and 2503 despite installing or uninstalling.
- Method 1: Reregister the Windows Installer.
- Method 2: Run CCleaner and Malwarebytes.
- Method 3: Install/Uninstall Foxit PDF Editor (PhantomPDF) with help Administrator Command Prompt
- Method 4: Run Explorer.exe as Administrator
What does MSI installer error 2502 and 2503 mean?
The difficulties of the MSI 2502 and 2503 installer on Windows 10, Windows 8.1 and Windows 7 are usually related to the C:\\Windows\\Temp folder giving incorrect NTFS permissions. To run Windows Installer normally, you need this folder, which can have full write permissions and simple ownership for your user account.
How do you fix the installer has encountered an unexpected error installing this package error code 2503?
Fixing errors 2502 and 2503 when installing or uninstalling
How do I fix Windows installer error 2503?
Fix errors 2502 and 2503 by installing or uninstalling
How do I fix error 2503 on Minecraft installer?
Fix errors 2502 and 2503 and install or uninstall
- Re-registration. Method 1: Windows installer.
- Method 2: Run CCleaner and Malwarebytes.
- Method 3: Install/uninstall Foxit PDF Editor (PhantomPDF) with administrator privileges using the command line.
- Method 4: Run Explorer.exe as an administrator.
What does MSI installer error 2502 and 2503 mean?
MSI installation errors 2502 and 2503 on Windows 10, Windows 8.1 and Windows 7 usually show that the Has c:\\windows\\temp folder has completely wrong NTFS permissions. For the Windows Installer to work properly, this folder really needs to have full write access and additional ownership for your user account.

Ermias is a tech writer with a passion for helping people solve Windows problems. He loves to write and share his knowledge with others in the hope that they can benefit from it. He’s been writing about technology and software since he was in college, and has been an avid Microsoft fan ever since he first used Windows 95.