Other ways to install .Net Framework 4.5 or higher on Windows 2003 Server SP2?

We're deploying an upgrade to our current system, upon launching the installer, the program/launcher gives us a message: "The application requires .Net Framework 4.5. Please install the .Net Framework 4.5 then run the installer again."

Is there any other way to install/upgrade our current .Net Framework installed?  Is there any alternative updates to consider.

We need your great minds here.

Thank you!

Server status:
Windows 2003 SP2
.Net Framework 4 Client Profile
.Net Framework 4 Extended
Jojo CastilloAsked:
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Dave BaldwinFixer of ProblemsCommented:
As this page shows https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/versions-and-dependencies , .Net Framework 4.5 (and above) is not supported on your system.  You need to recompile that software for .Net Framework 4.0 to work on that computer.

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Jojo CastilloAuthor Commented:
Hi, Dave.

Thank you for the response.  I'll take note of this.  If that's the case, is it possible/safe to upgrade our Windows 2003 Server SP2 to Windows 2008 R2 without affecting our current/live systems running on that server?
it_saigeDeveloperCommented:
Let me start by stating that I never fully support an upgrade from one server operating system to another.

That being said there are some considerations.

Is this server (being a Windows Server) a member of Active Directory or a Workgroup?
If it is a member of Active Directory, is it a Domain Controller?
If it is a member of Active Directory, does it host any AD specific processes or applications?
Is the operating system on it 32-bit or 64-bit?
If it is 32-bit, do you have a copy of Windows Server 2008 (non-R2; Windows Server 2008 R2 and above only come in 64-bit flavors)?
What other applications are installed on this server and do they support the new operating system?

If you do find that you have a 32-bit version of Windows Server 2003 and you have to install a 64-bit version of the new operating system, you will have to perform a full reinstall.

-saige-
Jojo CastilloAuthor Commented:
Hi, Saige.

Pls see my reply on italics as per your questions:

Is this server (being a Windows Server) a member of Active Directory or a Workgroup?
- Yes, its a member of AD (works as our webserver)
If it is a member of Active Directory, is it a Domain Controller? - No, just a webserver, running an applications with databases;
If it is a member of Active Directory, does it host any AD specific processes or applications? Yes, it does.
Is the operating system on it 32-bit or 64-bit? - 32-bit
If it is 32-bit, do you have a copy of Windows Server 2008 (non-R2; Windows Server 2008 R2 and above only come in 64-bit flavors)? - I'm not sure if we have a copy of Win 2k8 Server only, but just in case we have, could we use that to upgrade our 2k3 server SP2 without affecting our live systems/databases as if nothing happens after the upgrade just to to install needed .Net Framework version?
Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Dave Baldwin (https:#a42448469)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

seth2740
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