FAQ #3307, published on 2008-04-28
WINDEV
How to migrate a WinDev 5.5 project ?
In order to migrate a WinDev 5.5 project, you have to use WinDev 7.5. A "light" version of WinDev 7.5 is available here :

ftp://ftp.pcsoft.fr/windev7_mig

Please note that it's a french version.
See also : wd75, wd55, migration, upgrade, light