Dear community, after installing Sugercrm 6.4 I tried to install the dutch language pack (SugarForge: Dutch Language Pack: Project Filelist). But after uploading the module, the module installer doesn't work. I can fix it by deleting the language pack on the server.

Are the modules from Sugar crm backwards compatible? If not, does anyone have the sugar crm 6.10b1?

Thanks in advange!