Just installed 7.7 community a number of times.

Installing without a mouse using tab to advance the focus is unnecessarily difficult because the on-screen focus indicators are difficult to see due to lack of contrasting colors and very fine lines - quite difficult to see when the 3D buttons had focus...but yes its do-able in the end if you do a std install.... and squint a lot.

However.... trying to manually configure partitions had me wanting to throw the keyboard through the window. Seemingly illogical changes in focus advanced with tab or space or enter had me mashing the keys in frustration. At various times I'd lose the focus indicator entirely and then have to cycle through the screen hitting tab watching a field on the screen just to *find* the focus indicator again... I'm sure I also encountered a few times when it seemed like nothing had focus at all and I had to exit the partition manager screen to the main menu and re-enter and start again.

In the end I gave up.... walked back to the office and grabbed a USB mouse and completed the install easily. Satan surely had a mouse when he designed that screen.