There may be some changes you will have to make after installing the new DP. I had to move the VST dll to my location and I had to make a few changes to the registry. It doesn't appear that the VST path is saved in the registry.
I have my multisamples on the K drive, so you can see what happens in the regsitry settings below.
Here are the three registry (User, Local Machine and WOW6432) areas I changed. These are exported Regedit files. I masked my serial numbers and personal data with XXX's.
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Cakewalk Music Software\dp]
"History 01"="xxxxxxx"
"History 02"="xxxxxxx"
"History 03"="xxxxxxx"
"History 04"="xxxxxxx"
"History 05"="xxxxxxx"
"History 06"="xxxxxxx"
"History 07"="xxxxxxx"
"History 08"="xxxxxxx"
"History 09"="xxxxxxx"
"History 10"="xxxxxxx"
"Last File"="xxxxxxx"
"ProductKey"="xxxx"
"Sinc On Render"="xxx"
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software\dp]
"Company Name"="xxxxxx"
"Contents Folder"="K:\\Cakewalk\\Dimension Pro\\Content"
"Language"="English"
"Multisamples Folder"="K:\\Cakewalk\\Dimension Pro"
"RegUrl"="xxx"
"Serial Number"="xxxxxxx"
"Type"="Dimension Pro"
"User Name"="xxxxx"
"Version"="1.5"
"ProductKey"="xxxxx"
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Cakewalk Music Software\dp]
"Company Name"="xxxxxxx"
"Contents Folder"="K:\\Cakewalk\\Dimension Pro\\Content"
"Language"="English"
"Multisamples Folder"="K:\\Cakewalk\\Dimension Pro\\"
"ProductKey"="xxxxxxx"
"RegUrl"="xxx"
"Serial Number"="xxxxx"
"Type"="Dimension Pro"
"User Name"="xxxxx"
"Version"="1.5"