I only use offline installers and that is not going to change.

I noticed in my library (Windows 10) it shows about 70 of my games as updated.

Yet some of them appear to be the same exact version of the files I already have, at least according to the number of files and name of files including mentioned version.

So, is it worth re downloading them or should I just avoid wasting my time and bandwidth?

If it's the exact same file, your browser or download manager will normally tell you. In that case there's no need to redownload them.

So in your opinion I should just ignore the GOG site telling me the game was updated, as long as the numbers are the same.

I suggest following this thread:
https://www.gog.com/forum/general/the_what_did_just_update_thread_part_2_the_search_for_more_updates

Sometimes GOG only changes some insignificant files (like icons) or updates the installer, without any changes to the game itself.

Thank you.

The problem is I don't check for updates every day, some times it can take me a few months, by which point it is a pain to search through the forum for each game.
Nothing wrong with your reply or the thread of course, this is a GOG issue, but just saying. Thanks.
I am trying, but part of my stupid brain can't take it lol.

[url=http://www.gog.com/forum/general/gogrepopy_python_script_for_regularly_backing_up_your_purchased_gog_collecti on_for_full_offline_e] I recommend [/url]
using GogRepoC . For each installer file the program calculates a hash of your installer and compares it with a hash provided by Gog's API. If they do not match the file is downloaded, otherwise it is skipped.

It would also ensure that every downloaded installer is not corrupt.

Edit: I give up trying to work around the bug of multiple links in the same line.
Edit2: And still the link got screwed up