Yes they should. However, I just noticed that the "Update Only/HTML" link for Mega is still pointing to the old 0.35 version. The links to Gofile and Pixeldrain seem to be fine. I assume that the Mega link will be fixed soon (check if the last update of the original post is more recent than this post).
Just extract the three zip files in the same location. The easiest way to do that depends a lot on your operating system and on what zip extractor you are using. In Windows it should be as easy as selecting the three zip files together and then selecting Extract All.. in a folder of your choice. Alternatively, you can extract the zip files one by one, as long as you select the same target folder for all of them. You should not end up with separate folders for pack1, pack2, pack3 but instead you should have one Sluttown USA folder containing the HTML file and the Images folder. Inside that Images folder, you will find all images from the three packs (the last pack may have overwritten some files from the previous packs).
Now that one is hilarious because I have been proofreading all recent versions of the game and I did not spot this double typo ("secreat" and "techonlogy"). I just checked that they have been there in every version of the game since August 2021. Unfortunately I did not keep the versions older than 0.3, but these typos might have been present since the very first version. How did I miss them?
To answer your question, yes there is a Discord channel for this game. This is one of the perks of supporting the game via Patreon or Subscribestar. But you can also post the typos or bug reports here.