sha256sum checksum changes every time I download offline installer?

[summer sand]

I wanted to make sure I got a clean, uncorrupted download to a new machine that has no AV installed on it.
However, I downloaded the offline installer three times within an hour, https://www.avast.com/en-us/download-thank-you.php?product=FAV-AVAST&locale=en-us&direct=1 and each one has a different checksum suggesting some small difference between each of the three downloads.

[DavidR]

My guess would be that the full off-line download includes the Virus Definitions, which if periodically incorporated could result in a change.

However, 3 times in an hour seems a lot.

[summer sand]

Having some issues with my ISP, so I'm not sure.

I just downloaded twice more from the link at https://www.avast.com/en-us/installation-files

https://www.avast.com/en-us/download-thank-you.php?product=FAV-AVAST&locale=en-us&direct=1

10:22 PM EDT
Name: avast_free_antivirus_setup_offline.exe
Size: 691098296 bytes (659 MiB)
SHA256: 779B596D990660A8525CA9F49655044B29B64343B21697A7247EFFA7FFA1E75A
SHA1: 23E883F8E93AA320EC6C7576B79804D0216237A6

10:40 PM EDT
Name: avast_free_antivirus_setup_offline (1).exe
Size: 691098304 bytes (659 MiB)
SHA256: DEA8F9DE1509DC3249C831E399A7D30C1DA16E9A19ACF4DD6334782504326938
SHA1: 943283BA788D67F2018B1D512A1BBE385E7A33A4