PLEASE ADVISE: I cannot open web based PDF

Further to my query 2 days ago, when I could not open pdf document on a web based course, now I cannot open any pdf on any web site!

I started a web-based course, reputable site.
The web stated Safari is the best for the media used in the course.
First attempt: could not complete, needs Adobe flashplayer (though I set the Safari preference security to "allow all other plugins").
OK, I installed this, and hurray! excellent.
Then there are links of the "manual" to read through the course. Opens blank tab, with message states: needs Adobe Reader. I do not have this.
OK, go to main Adobe web site, download and install. This wants to be the "default" instead of Preview.
Nope, do not want the change of my default. But then, have to make the change.
Nope, Adobe Reader not opening the link.
Now, I un-installed (deleted) the Adobe Reader, kept the Adobe Flashplayer. Still can not read any material in the links (blank tab), normally or usually, any pdf will open when the security preference is to "allow all other plugins"!!
Yes, I can do the course, but I cannot read materials in any links, which are pdf. Probably will fail the test at the end. If so, who will compensate my course fee?
Totally disappointing experience.
I looked to find where the Adobe Flashplayer is installed, but there is not any, though there is Adobe Flashplayer Uninstaller!!
Any comments or advice?
In summary, now I cannot open any pdf web linked site.

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