Install Sharepoint designer 2007 and 2010 on single machine

Today I encountered with interesting problem: I needed to install both versions of Sharepoint Designer (2007 and 2010) on single machine. The problem was in architectural versions of the application. On my host I have Windows 7 x64 and Office Professional Plus 2010 x64 installed. Sharepoint Designer 2007 doesn’t have x64 version so I just installed available x86 version first (by going from earlier version 2007 to the most recent 2010 version). In opposite Sharepoint Designer 2010 exists for x86 and x64 architectures. As I have most of software for x64, I tried to install SPD 2010 x64 first. But during installation I encountered with the following error message:

I will provide also text here for search engines:

You cannot install the 64-bit version of Office 2010 because you have 32-bit Office products installed. These 32-bit products are not supported with 64-bit installations:

    Microsoft Office SharePoint Designer 2007

If you want to install 64-bit Office 2010, you must uninstall all 32-bit Office products first, and then run setup.exe in the x64 folder. If you want to install 32-bit Office 2010, close this Setup program. and then either go to the x86 folder at the root of your CD or DVD and run setup.exe, or get the 32-bit Office 2010 from the same place you purchased 64-bit Office 2010.

Quite interesting. Ok lets try to install SPD 2010 x86. No luck either:

You cannot install the 32-bit version of Office 2010 because you have 64-bit Office products installed. These 64-bit products are not supported with 32-bit installations:

    Microsoft Office Professional Plus 2010

If you want to install 32-bit Office 2010, you must uninstall all 64-bit Office products first, and then run setup.exe in the x86 folder. If you want to install 64-bit Office 2010, close this Setup program, and then either go to the x64 folder at the root of your CD or DVD and run setup.exe, or get the 64-bit Office 2010 from the same place you purchased 32-bit Office 2010.

So I’m not able to install SPD 2010 x64 because of SPD 2007 x86 is already installed and I can’t install SPD 2010 x86 because I have Office 2010 x64 installed. In order to proceed I uninstalled SPD 2007 and installed SPD 2010 x64 first. It was installed successfully in this time. And after this I successfully installed SPD 2007 x86. Now I have both SPD 2007 and 2010 running on the single machine. Hope it will help someone who will encounter the same issue.