Parallels Desktop 10 (Build 27675) cannot be installed on a older Mac with 10.7.5 Lion and 32bit EFI due to the lack of the 64bit-Kernel-Mode. Is this a Bug or are these the new System Requirements? Btw: absolutely no problems with PD9 and Mavericks on the same machine.
Thanks for your answer as well as the link to the System Requirements. In comparison to Version 9, the 32bit Kernel as well as 10.6.8 Snow Leopard are not supported anymore in Version 10.