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Hi Santiago,
Welcome to Microsoft Q&A!
Thanks for sharing the details — you're doing a great job trying to modernize an older PC setup. The error you're seeing typically means the app you're installing (in this case, Microsoft Teams) depends on a newer version of the System.ValueTuple assembly that isn't present or properly registered on your system, even if .NET Framework 4.8 is installed.
To better assist, can you tell me which version of Windows you're having currently? You can check it by pressing Win + R > type winver > Enter and share the screenshot here (after blurring private info). It'll help us recheck if there's any particular problem with the edition, and figure out the most suitable solution. In the meantime, here are some basic troubleshooting steps you can try to see if it improves your situation:
1 - Install .NET Framework 4.8 Developer Pack:
- Download latest .NET Framework - free official downloads
- Download the Developer Pack (not just Runtime)
- Try the 4.8 version first. If it doesn't work, download 4.8.1 instead
- Download the latest .NET Core Runtime (optional): Browse all .NET versions to download | .NET
2 - Manually add System.ValueTuple (more advanced solution)
- Download the latest NuGet package at https://www.nuget.org/packages/System.ValueTuple/
- Rename the
.nupkgfile to.zipand extract it - Open the lib folder > netstandard1.0 or net47 > copy
System.ValueTuple.dllto:-
C:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.ValueTuple\ - And/or
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.8\
-
- Open Command Prompt (Admin) > run
gacutil /i "path\to\System.ValueTuple.dll"
Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads and thoroughly research any product advertised on the site before you decide to download and install it. Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
3 - Use the .NET Framework repair tool
- Download Microsoft .NET Framework Repair Tool from Official Microsoft Download Center
- Run the tool and follow the repair process > Restart your computer
If none of these work, the issue might be that the hardware itself is too outdated for the current Teams desktop app, and you'll need to either use the web version or request a system upgrade from your IT department. Thanks for your time!
If this reply is helpful, please click "Accept Answer" and kindly upvote it to assist others who might face similar problem. If the issue persists or you have extra questions, please click "Comment" instead.
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