Method 1: Clean the Disc and Check the Optical Drive
If you are installing Office from a disc, the first thing you should do is to clean the disc with a soft cloth and make sure there are no scratches or dust on it. Then, insert the disc into another computer and see if it works. If it does, then the problem may be with your optical drive. You can try to update the driver for your optical drive or replace it with a new one.
Method 2: Copy the Disc Content to a USB Drive
If you have another computer with a working optical drive, you can copy the content of the Office disc to a USB drive and then use it to install Office on your computer. To do this, follow these steps:
Insert the Office disc into the other computer and open File Explorer.
Right-click on the disc drive and select Copy.
Insert a USB drive into the same computer and open File Explorer.
Right-click on the USB drive and select Paste.
Eject the USB drive and insert it into your computer.
Open File Explorer and double-click on the setup.exe file in the USB drive to start the installation.
Method 3: Download Office from Microsoft Website
If you have purchased Office online or have a product key, you can download Office from the Microsoft website and install it on your computer. To do this, follow these steps:
Go to [Microsoft Office Download] page and sign in with your Microsoft account.
Select your version of Office and click Install.
A setup file will be downloaded to your computer. Run it and follow the instructions to complete the installation.
Enter your product key when prompted to activate Office.
Method 4: Disable Anti-Virus Software Temporarily
Some anti-virus software may interfere with the installation of Office and cause the Osetup.dll file to be corrupted or missing. To avoid this, you can disable your anti-virus software temporarily before installing Office. Remember to enable it again after the installation is done. To disable your anti-virus software, follow these steps:
Right-click on the icon of your anti-virus software in the system tray and select Disable or Exit.
If prompted, choose how long you want to disable it and confirm your choice.
Install Office from the disc or the ISO file as usual.
After the installation is done, right-click on the icon of your anti-virus software in the system tray and select Enable or Start.
We hope that one of these methods can help you fix the Osetupdll Digital Signature Not Valid Or Is Not Present error and install Office successfully. If you still have any questions or problems, please feel free to contact us for further assistance.
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