This is usually due to another Office installation or update process in the background or older MS Office installation files that have not been thoroughly removed from Windows. Here are a few ways you can fix it and get Office 365 up and running.

How do I fix the Another installation is in progress error?

Another installation is in progress message can prevent you from installing Office 365 on your PC. This can be a big problem, and speaking of installation problems, here are some issues that users reported:

Microsoft Office error code 0-1018 (0) This problem can occur if your system files are corrupted, but in order to fix the problem, you need to repair your installation by performing an SFC and DISM scans. Office 365 error code 0 This error can sometimes appear due to your antivirus, and in order to fix the problem, you need to temporarily disable your antivirus and check if that helps. Couldn’t start Office installation error code 0-1018 (0) Another cause for this issue can be your firewall, and if you can’t install Office, be sure to disable Windows Firewall temporarily and check if that helps. Error 1500 another installation is in progress Microsoft Office If you encounter this error message, be sure to disable any other installations that might be running in the background. You can do that with ease by using Task Manager.

1. Check for Another Installation Process

Sometimes you might have another installation running in the background, and that might give you Another installation is in progress message while installing Office 365. To fix this problem, you need to stop the installation on your own or use the Task Manager to end the installation process. It’s also worth mentioning that Windows Installer and msiexec processes can cause this problem to appear, so if you see them running, be sure to disable them. After closing the problematic process, try to install Office again.

2. Fix Error 0-1018 0 With the System File Checker

In some cases, your installation can become corrupted, and that can cause Another installation is in progress to appear. If you encounter this issue while trying to install Office 365, you might be able to solve the issue by performing an SFC scan. Once the SFC scan is finished, check if the problem is resolved. Several users reported that the issue can persist even after you run an SFC scan. If that’s the case, you need to run DISM scan by doing the following: After the DISM scan is finished, check if the problem is still there. If the problem is still there, or if you weren’t able to perform an SFC scan before, be sure to run the SFC scan again.

3. Check your antivirus

In some cases, Another installation is in progress error can appear due to your antivirus. Third-party antivirus can often interfere with your system and cause this and other problems to occur. To fix the problem, it’s advised to temporarily disable certain antivirus features or your antivirus altogether. If that doesn’t work, your next step would be to completely remove the third-party antivirus from your PC. Windows 10 comes with Windows Defender that works as a default antivirus, so even if you remove a third-party antivirus you should remain protected. If removing the antivirus solves the issue, you should consider switching to a new antivirus solution that offers maximum protection that won’t interfere with your system. SPONSORED

4. Register Office 365 DLL Dependencies

Office 365 might be missing some DLLs (dynamic link library files) required to launch.

5. Uninstall Other Office Versions

Sometimes previous versions of Office can interfere with your current installation and cause Another installation is in progress error to appear. If that’s the case, you need to find and remove all Office installations from your PC. You can do that using the regular method, but this method can sometimes leave certain files and registry entries behind. These leftover files can interfere with future Office installations, therefore it’s always recommended to use uninstaller software to remove applications from your PC. If you’re not familiar with it, uninstaller software is a special application that can remove any application from your PC, but it will also remove all files and registry entries associated with that application. Once you remove all previous versions of Office from your PC, the problem should be completely resolved.

6. Run the Office 365 FIXIT Tool

7. Disable Windows Firewall

Sometimes Another installation is in progress error can appear due to Windows Firewall. Office 365 installations need to download certain files from the Internet, and if your firewall is blocking it, you might encounter certain error messages. To fix this problem, it’s advised that you temporarily disable your firewall.  After you disable Windows Firewall, try to install Office 365 again and check if the issue reappears. Once you manage to install Office 365, turn back on your firewall.

8. Install the latest updates

Sometimes this error message can appear due to certain glitches on your system. However, Microsoft is working hard to fix these problems, and the best way to fix them is to install the latest updates. For the most part, Windows 10 installs the missing updates automatically, but sometimes you might skip an update or two. Windows will now check for available updates. If any updates are available, they will be downloaded automatically in the background and installed as soon as you restart your PC. Once your system is up to date, check if the problem is still there. Now you should be able to install Office 365 on Windows 10 with those fixes. The Microsoft Support and Recovery Assistant tool for Office 365 and Outlook, which this Windows Report post provides further details for, might also come in handy for fixing errors 0-1018 0 and other things.

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