I have tried several times to download i t but when it's time to isnall it there are always corrupted or missing files so I start the download again but so far I haven't been able to download the whole program successfully.
This is a 330 MB download (+104 MB if you want to install MultiTerm as well). There is an alternative link to download via FTP:
Have you tried that? Have you tried with another browser and/or on another computer?
Also, I have Windows 8 in this new laptop, do I need to inslall OFFICE as well?
Office is not needed to import, translate and export Office documents, but it can be useful to have it.