Important if Upgrading from 18.104.22.168 or Earlier
A number of file changes have been made in this new release. In particular the layout and turbine data files have had major revisions. Consequently the files are not backward compatible, and therefore it is necessary to back up the data of any projects previously developed. It is also essential that all users that share files within a company are updated to the new release at the same time.
The simplest form of backup is to copy the entire default project folder C:\WindFarmR4 to a new folder, say C:\WindFarmR4Backup. You may of course be using a different drive and / or name for the default folder.
After backing up your projects uninstall your present release using the Control Panel / Add or Remove Programs. Then install the new release and your projects should be ready for use.