I got this from Cakewalk support when my Adode Audition wasn't showing up in the Tool dropdown. Hope it helps. Every place that it says Cool Ediit, change it to iZotope RX.
Click here for to downlod the Blank Tools Menu Entry.reg file. 1) Copy the Blank Tools Menu Entry.reg to your Windows Desktop.
2) Choose Start | Run.
3) In the Open window, type REGEDIT, and click OK.
4) Click the Plus sign next to HKEY_LOCAL_MACHINE.
5) Click the Plus sign next to Software.
6) Click the Plus sign next to Cakewalk Music Software.
7) Click the Plus sign next to Tools Menu.
8) Click once on the folder labeled Tools Menu so it is highlighted.
9) Choose Registry | Import Registry File.
10) Locate the Blank Tools Menu Entry.reg file on your Desktop and double click it.
11) You'll now see a dialog box open that says Blank Tools Menu Entry has been successfully entered in the Registry. Click OK.
12) Beneath the Tools Menu folder, you'll see Blank Tools Menu. Click this once to highlight it.
13) On the right hand side of the screen, double click on the item that says ExePath.
14) In the Value Data field, type the path to Cool Edit's .exe file. You can find this by right clicking on the Cool Edit shortcut and choosing Properties.
15) On the right hand side of the screen, double click on the item that says MenuText.
16) In the Value Data field, type Cool Edit.
17) On the right hand side of the screen, double click on the item that says Status Bar Text.
18) In the Value Data field, type Run Cool Edit.
19) Close the Registry Editor and restart your computer.
You should now have Cool Edit in your Cakewalk Tools menu.