Posted Apr 02 2020 - 02:34 PM
I think the most likely explanation is that the files are being corrupted during the download process. Does your internet connection show any problems, such as slow speed, or does it pause partway through a download and then resume again? Does your browser display web pages 100% correctly? If you download one of these "encrypted" files, what happens if you try to download it again immediately? Do you get the same result? Try using the command-line "file compare" utility to check that the files are the same. To do this:
 Press "Windows + R"
 In the Run box type in CMD and press enter.
 When the command line appears, use CD to switch to your download directory.
 Type in:
fc /b file1 file2
Where "file1" and "file2" are the two copies of the file you downloaded.
This performs a file comparison using the "/b" switch for binary mode. Hopefully, you should get a message saying that the two files are identical. If not, then one or both of the files have been corrupted during the download, and you should do some troubleshooting on your internet connection to improve its quality.
If the files are identical, and you don't seem to be getting any corruption or interruption during the download, then I'm afraid I'm puzzled.