I installed the current 2.9.0 version and it sent me errors when I was intalling it.
The error was related with the tables creation for innodb, I do not have the exact error message, but, to fix it, is very simple, just do a ‘Find in Files’ the string
and replace it with
Please do it before you start your fresh install, but for any reason you already encountered the error and are stuck with that ugly message, just Remove ~\dolibarr\htdocs\conf\conf.php and start over with your installation.
Jorge