I need to download the version 7.3.5 of Devexpress to make integration with Strataframe 1.6.5.

Where can I download this version exactly?

I thought that you may be running the latest version of DevExpress.  If you want to use 6.3 you can.  Just change the Inherited UI references back to 6.3.  It is setup for 7.3.5 in the install right now and we have compiled assemblies out on the Posted Releases for 7.3.8 and 8.1.1.

Yes.  DevExpress changed some objact base types and namespaces in 8.1.1.  Nothing major but just enough to throw a few wrenches in the gears.