Sorry to say that Windows 98 is no longer supported by any hardware or software manufacturers so you won't find a new anything that will work with it. You had trouble saving the file only because it is a PDF format and the "rules" are different. The floppy icon is the easiest way, but you can also use 'File, Save As' on the menu. You can't copy and paste PDF files. At least you can save most of them these days, used to be they wouldn't let you do that at all.