Downloaded LO 5 to Win 8.1 and LO won't open

Error message is “Cannot open because mergedlo.dll is missing from your computer.” Reinstall didn’t help; ‘repair’ didn’t help. English versions

Seems that downloading the newer version and overwriting the existing version was the problem. I uninstalled everything LO, then uploaded LO 5 again and am now able to open and use it.