Download software/software updates
A. I am occasionally told there is an update to software I have installed, either purchased or freeware.
B. Often the update is from a third party site, i.e., CNet.
C. While these third party sites are often well known, and after download are scanned by security software before being installed, I am still somewhat skeptical since they did not come directly from the manufacturer.
D. Is there any way to check that the software downloaded has not been detracted from/added to by the third party site?
E. Concurrent with A.-D., what are the better/best software products for encryption of data both retained on the drive and sent over the internet?
F. Thank you for your kind consideration of these queries.