Can I uninstall??

Go ahead and uninstall.

Essential should have installed into something like
C:/Program Files/Cakewalk/x1 essential.
Studio likewise Ina folder called X1 Studio.
Producer will be installed into folder called, you guessed it, Cakewalk/X1 Producer
All the folders other than those will be shared folders.So make sure your content files ie projects are somewhere else and just go ahead and uninstall the 2 versions before installing Producer. It is a complete separate and full installation. Upgrade is a reference to a pricing discount for owning a lesser or previous version. The actual installation doesn't rely on or search out previous versions. That's all taken care of at time of purchase when your program is registered.
Once Producer is installed make sure to get all the patches ie to X1 C Produce, X1D Producer and if you have gotten Producer E panders make sure to check that you download the appropriate X1D update for your version.
All the best

Here's a quote from the Sonar X1 Welcome info:  Removing previously installed Cakewalk products after installing SONAR X1 may remove some  plug-ins. Either uninstall previous versions first, or do a “Custom” re-installation of the effects  and synths from the SONAR X1 installer. Never remove previous versions manually by deleting  folders that contain the software.  Hope this is helpful..... 

I don't know about danthevan, but my hard drive has lots of room but I think about backup space.  One of my main backup tools is Norton Ghost and I do mainly full Ghost backups - had too much trouble with incrementals.  Thus all those extra, and likely unused products, take up a lot of backup disk.
--Larry

Guitarhacker


buy a second drive for storage and backups and sample libraries....

even one of the external drives will work well for that. 

I have all my storage on a large second drive so my C drive can run the OS and the applications.  I have a similar sized external attached for back ups of mission critical data & files too. 

I think you missed the point of the previous post.  He's talking about his C: partition getting bigger due to unneeded programs installed.   I have the same concerns because I also do regular backup images of my C: partition... and no amount of large external drive space makes me feel better about bloating up my system drive with unneeded apps.
 
And bottom line, it's just not efficient to operate that way.
 
I used to load all kinds of software without a thought as to the space/resources it took up:  demos, free FX and libraries, etc... Until I saw that my backup image was taking 50 minutes to run.  So I went through, uninstalled all the unneeded apps, cleaned the registry... and now I'm back to a comfortable 15 minute backup process.  
 
I believe that's what Larry was referring to.