I just installed Blender 2.80. Went well, new version looks good. BUT... it wiped out my existing 2.79 exe and won't let me reinstall 2.79. I need 2.79 to do scenery development for Xplane 11. What must I do to get back to Blender 2.79? Would be nice to have both 2.79 and 2.80 installed, but MUST have 2.79! Please help.
Download the archive version of 2.79b for your platform, which doesn't require installation.
Once extracted you should be able to run Blender 2.79b normally. Unlike the installer the archive doesn't give you a start menu entry or shortcut. You will need to create that shortcut yourself or start it directly from the directory the binary is in.