I have finally resolved the issue of the Igor.dll file disappearing. While I can’t really confirm this, McAfee had deleted the file without warning me, and because of its negative reputation as an Antivirus, I have it uninstalled, thus resulting in me doing a fresh install of Gamemaker. Development of this game will now resume normally.

Thanks to folks over at the Gamemaker / Itch community, as well as my mutuals for the help. I I couldn’t have done this without you.