Mine are in exactly the same folder.
 
Interestingly, the datestamp for both of mine are different to yours.
 
The.dll is 30-Aug-2010
The .exe is 06-May-2010

I think mine are from X3. I don't think I ever upgraded them when I bought platinum.
They are the same versions as X3 anyway.
 
Its been a few posts here and im just curious... what is the OP's issue again ?

https://www.cakewalk.com/My-Account/Products
 
https://www.cakewalk.com/My-Account/Product/CWDM150
 
Are these above two links working on browser?
The installer files can be downloaded from outside Command Centre.
Save them in a folder and please run the installer by Right-clicking and Run As Administrator.
 
Hope that will help and will create Desktop Icon.
Then DimPro can be run as Stand Alone directly and once vst scan is run that will be fetchable by Sonar (if sonar and dim pro installed with default settings.)
 
Regards
Snehankur

OK, I've tried everything!!!  So now I find an old Sonar 8 CD and one disk is Dimension Pro.  So GREAT I says!  I load the CD, run the set-up-everything is going OK.  I think I'm all set.  I check the C: Program Files>Cakewalk>VstPlugins>Dimension Pro and I still get the same thing:  Dimension Pro.dll.  I check Cakewalk Plug-in Manager, VST Instruments and it doesn't show Dimension Pro. When I click on DirectX Instruments Dimension Pro it's listed there.  So I go to Insert>Soft Synths>DirectX>Dimension Pro and I get "Failed to insert soft synth. This synth may not be properly installed"  Any other observations? Thanks

Tropical Cowboy
I check the C: Program Files>Cakewalk>VstPlugins>Dimension Pro and I still get the same thing:  Dimension Pro.dll.

Good, that's what you want. Go to Edit > Preferences > File > VST Settings > Scan Options. Click on Reset, then click on Scan. That should do it for you.

Thanks for the advice Craig.  I did exactly what you posted: Go to Edit > Preferences > File > VST Settings > Scan Options. Click on Reset, then click on Scan. Unfortunatly, it didn't work. I checked again: C: Program Files>Cakewalk>VstPlugins>Dimension Pro and still got the same thing:  Dimension Pro.dll. While in Platinum I tried again to Insert the plugin but again got "Failed to insert soft synth. This synth may not be properly installed"  I don't know what to do at this point!! Grrrrrrrrrrrrrrrrrr!

What kind of Anti virus are you using ?
 

Assuming this is on 64bit Windows and the intent is to get 64bit DPro for 64bit SONAR....
IIRC, SONAR 8 included a DXi version of DPro. This means the dll in the VST path is from a previous install attempt.
To register DPro -

• DPro must be run stand alone as administrator. I am not sure where the stand alone is for this version but would guess it is in either "C:\Program Files\Cakewalk\Dimension Pro" or "C:\Program Files\Cakewalk\Shared Dxi\Dimension Pro." There should be instructions included with SONAR 8 regarding DPro registration.
• A serial number and registration code for that release must be used. It may be in your store account. The item will be listed as "Dimension Pro" NOT "Dimension Pro 1.5" and the serial number will start with CWDM110

This is an old release and should be updated. The v1.2 update is here. The v1.5 update is here.
The expansion packs are not included in this release. They may be found here.

 
Hi Tropical Cowboy,
 
The error message you mentioned will pop up if you are running a 32-bit DXi in 64-bit SONAR. To get around this, you can open SONAR with Admin privileges by right-clicking on SONAR's icon and selecting "Run As Administrator" 
 
I am also curious as to why the VST version is not showing up. Give the following a try: In SONAR, go to Utilities > Cakewalk Plug-in Manager. Check to see if Dimension Pro is appearing under the 'VST Instruments' section. If it is not, select 'VST Audio Effects' and check to see if Dimension Pro is listed in there. If it is, single-click on Dimension Pro and then click on 'Plug-in Properties'. In this Window, make sure 'Configure as Synth' is applied and click OK. 
 
If neither of these suggestions seem to do the trick, let me know and we can take it from there.

Welcome to the forum

Mike Lally [Cakewalk]
The error message you mentioned will pop up if you are running a 32-bit DXi in 64-bit SONAR. To get around this, you can open SONAR with Admin privileges by right-clicking on SONAR's icon and selecting "Run As Administrator" 

It should be so easy.
 
Unfortunately, unless something has recently changed, there are no amount of privileges, praying and persuading that will get 32bit DX plug-ins loaded in 64bit SONAR. AFAIK 32bit DX plug-ins do not appear in 64bit host plug-in lists. The only way I know to load 32bit DX plug-ins in 64bit hosts is with a DX-to-VST wrapper. Even then the results are not great.
 
It still may be the case that 64bit SONAR needs administrator privileges to run the 64bit DPro DXi. I do not have the old DXi installed.
 
Or this could be about 32bit SONAR, DPro and Windows. It is not clear what versions the OP is running.