REACH Regulation (Regulation (EC) No 1907/2006) requires manufacturers to provide Safety Data Sheets (SDS) to their customers and consumers if the preparations are considered as dangerous or if they contain dangerous substances. According to Article 31.5 of the regulation, SDS must be translated into official local languages in this case.
For the other preparations, this obligation does not apply. Epson nevertheless provides the same type of data for those preparations, but only in English. This is the reason why you might be able to download some SDS only in English.