I bought several eBooks for Adobe PDF download. Am I able to download with the adobe program that I

I just purchased a library worth of eBook downloads from the Nonviolent Communication Academy bookstore.  I chose Acrobat PDF download, but do not know how to be sure that the books have been downloaded and saved.  Do I have the Adobe program necessary to contain several eBooks?  Once I close the download page, I cannot have access to it again.  So, now or never.  There is a storm here and with my luck the electricity will go out. Please assist me.