Try right clicking on the file name and choose save as.
Then use Acrobat Reader to view them - can be downloaded from adobe.com
If you are doing all this, then I am not sure what the problem may be - give more details of the symptoms of the problem.
AMD Radeon Adrenalin release date, new features, compatible graphics cards
Indie publisher Canongate’s top 10 book covers of 2017
New iMac Pro release date, UK price & specs rumours
Tablettes Amazon Fire : quel modèle choisir ?