The PROMOTIC version 7.5 (no matter if 7.5.0 or higher) is very important because all currently running PROMOTIC applications (if the upgrade to the PROMOTIC 8 version is wanted) will have to go through this version first. The PROMOTIC version 8 is able to work only with applications, that went through the version PROMOTIC 7.5. The main reason is, that PROMOTIC version 8 no longer contains agorithms for transforming very old applications.
The PROMOTIC version 8 no longer supports some very old (not offered for a very long time) technologies. Therefore in this version 7.5, there is a new item "Warnings" in the INFO system, that is displaying warnings regarding the usage of obsolete components in current application.
One additional item that is no longer available since version PROMOTIC 8 is the "MDI type main window". The main reason for that is the fact, that using the PmaWorkspace object as a main window is positively much simpler, more general and practical than the "MDI window". If the application is using the "MDI" (all applications older than PROMOTIC 7), then this fact will also be highlighted in the "Warnings" item of the INFO system and the designer can simply transform his application in order to use the main window of the PmaWorkspace type.
Because the PROMOTIC version 8 no longer supports the obsolete saving formats, it is necessary for those who use Compound Pmg objects (these objects are saved in independent files with the extension *.pmi), to transform these objects into version PROMOTIC 7.5.