Problem with installing AF Utilities - hash issue

Dear KNIMErs,

I tried to download the AF Utilities extension by @AnotherFraudUser because I somehow need to be able to write to Excel macro files (xlsm), as described also in this post:

Can Excel Cell Updater not write to xlsm files?

So I searched the forums and found that AF mentions his extension can do this (and I know it has a lot of other very useful tools) hence I wanted to install it. But I do get this very strange message, that says something about the SHA-256 hash is not as expected, see screenshot.

The interesting part, that in the version I try to install this in (5.4.4) it throws me this error. If I download the self-running zip of version 5.9.0 from the download page at knime.com I can install it without problems.

I wonder if someone has ever encountered a similar problem?

Thank you in advance.