Unable to download "Prise en maind'Adobe Digital Editions(EPUB, 64 Ko)"

Hello, I have installed Adobe Digital EditionsI 4.5.8 but am unable to downlaod the "Prise en maind'Adobe Digital Editions(EPUB, 64 Ko)" which is nedded o convert teh files to EPUB files.  I am using Windows 10

Error Message received:

The requested URL /content/dam/acom/en/products/digital-editions/assets/welcome.epub was not found on this server.

Could somebody help? Otherwise, my e-reader is unusable.

thanks a lot

Catherine