windows 7 Pro SP1, Toshiba Satellite C55A, downloaded 5.6.1 on Nov 15, install has failed 3 times, on the same error (approx) “no permission to access …\LibreOffice 5\program. Log on as administrator or run go get one”. I AM the administrator. I have gone in and assigned full control to the adminstrator, system, creator owner, creator group. I am the same user that installed 5.1.3.
Best part is every time the install fails and it says it has made no changes, well, it actually has complete removed 5.1.3, so I have to use system restore to make my system usable again.