Thanks for the reply Mary G.  I guess I have no choice but to invest in a new desktop if I want to run Windows 11.   Not sure if I can just upgrade the processor to solve this issue ?

Unfortunately not, intel doesn't support a motherboard for more than 1 or 2 generations. 

Your processor is 4th gen and minimum required is 8th gen, so processor upgrade is also not an option for you. 

Don't be a hurry, let windows 11 come, lets see how online community deals with this, there may be workarounds or they may not. Any ways windows 10 is supported for 4 more years. 

Yup wait 

Don't be too optimistic though 

Microsoft seems pretty strict this time. They kinda want to control the hardware their OS runs ON 

Thank-you for the info XPS_Man.  Yes It is unfortunate that I have an older PC with 4th gen processor.  It is still running great and support what I needed to do.  Just wish that Microsoft will be able to have a workaround to upgrade to Win11 for people like me.   

I guess I have no choice but to wait for it to come.  Hopefully by then,  Microsoft will have a solution for my TPM/PTT issue.   Also,  at this point  I don't plan to buy a new PC just to have Win11 running as I initially spent a lot of money getting my current system and hoping that it will last me for a while...

@Kermit4 

The app usually tells you about free upgrade.

https://aka.ms/GetPCHealthCheckApp

Your device must be running Windows 10, version 2004 or later, to upgrade.

Please press the blue Accept as Solution Button Below if this post answers your question.

Free updates are available through Windows Update in Settings>Update and Security.
Graphics card Compatible with DirectX 12 or later with WDDM 2.0 driver.
High definition (720p) display that is greater than 9” diagonally, 8 bits per color channel.
Trusted Platform Module (TPM) version 2.0.
https://docs.microsoft.com/en-us/windows/security/information-protection/tpm/trusted-platform-module-overview
Check here for instructions on how your PC might be enabled to meet this requirement.
https://support.microsoft.com/windows/1fd5a332-360d-4f46-a1e7-ae6b0c90645c

Microsoft Management Console

Press [Windows Key] + R or select Start > Run.
Type “tpm.msc” (do not use quotation marks) and choose OK.
If you see a message saying a “Compatible TPM cannot be found,” your PC may have a TPM that is disabled. See How to enable TPM for more information or check your PC manufacturer’s support information for instructions to enable the TPM. If you are able to enable the TPM, complete the next step to verify that it is a TPM 2.0.
If you see a message confirming TPM is ready to use, check
Specification Version under TPM Manufacturer Information
to verify it is 2.0.
If it is less than 2.0 your device does not meet the
Windows 11 requirement.
https://www.dell.com/support/kbdoc/en-us/000189676

DELL that can upgrade
https://www.dell.com/support/kbdoc/en-us/000132583

Warning

The following apps will not be removed on upgrade but will no longer be installed on new devices or when clean-installing Windows 11. They are available for download from the Store:
3D Viewer
OneNote for Windows 10
Paint 3D
Skype

Although my XPS8700 processor is old i7-4790 and probably not able to meet the requirement to install Windows 11 especially if I am missing TPM 2.0.  One thing I don't understand is that I do have bitlocker running in my system.  If I don't have TPM or PTT,  how can I run bitlocker ?  My understanding is that bitlocker requires this security protocol.   Please correct me if I am wrong.  

Check this video I found. https://www.youtube.com/watch?v=NivpAiuh-s0