I have Local Admin rights to my system only, which has been sufficient for installing and running LibreOffice up to 5.3.6. Today I installed 5.3.7, gave it the requested Local Admin rights, and it does install for a while, also removing the previous installation, but then stops, saying
Error 1303. The installer has insufficient privileges to access this directory: C:\Program Files\LibreOffice 5\program. the installation cannot continue. Log on as an administrator or contact your system administrator.
Access to the said directory is indeed not possible with my Local Admin privileges. I wonder whether the problem is a change in how LO installs or whether recent Microsoft Win10 updates did changes to the system to prevent my access to the directory.
The worst thing, however, is, that LibreOffice killed the working installation of the previous version!