Is anyone having issues trying to install P3Dv5.3? I am starting to get frustrated. I did a clean uninstall of 5.2 and I downloaded the full package from the website. The next day, after the download was complete, I was having issues unzipping the file. When I used 7-zip to unzip the file I found the file with many files missing, mainly scenery.cab's. Last night I installed the missing files from the website individually, and then when I tried running the scenery installer it said something about Scenery3.cab was not digitally signed? Then I found out the setup.p3d was actually not downloaded and when I tried to use it (in the same file as the other files where it should be), it said setup error and this is the code it gave me: 
0x80091007- The hash value is not correct.

Any ideas on this? Thanks for your time.

From what I read it appears that the program has not d/loaded correctly.  You will have to try again

Unless the program d/loads and unzips correctly do not to try and install any parrts manually, ONLY run SETUP as administrator

It looks like part of the data you got was not the same file that the installer expects. Your internet connection may have dropped some packets while downloading the file, causing the data to get malformed. The error just shows that while checking the checksum was incorrect for that section of data, so it's probably something to do with your internet setup or connection.

Thank you guys. Probably is my Internet since I’m away on business in a hotel. Will try different browsers to see if it’ll download properly. 

Try https://www.freedownloadmanager.org/ 

I used it to download P3D5.3 with no problems.