See how frustrated it can be? Here are a few of the solutions provided..
“I have the same problem. I found a workaround -
Close IE
Open Adobe Reader as an application from the start menu
Under the Edit menu, select Preferences
Under the internet category, uncheck the first option “Display PDF in browser”.
This will cause the pdf file to download and new window to open whenever you click on a PDF file (you may have to click the OK to download to allow the PDF file to download), but you should be able to save.
I found that some websites would not allow the file to download even though I clicked the OK to download button. For those websites, I had to change the setting back to open in browser. Also for those websites, the save button works. Rather inconvenient if you go between the two websites.” Cal Irish
“I have a client who is an attorney who was have the same issue saving a document from:
https://ecf.vtd.uscourts.gov
I found that if I added the site to my trusted sites and lowered my settings in IE to medium low for trusted sites, I was able to save the Acrobat documents.” Charles05663