You cannot use the original PlugY 11.02 installer from a decade ago. You need the community-updated version (often found on GitHub or the r/diablo2 subreddit) specifically compiled for 1.14.
If you are sticking with 1.14b for specific reasons and encounter errors: Compatibility Mode : Right-click , go to Properties, and set compatibility to Windows XP (Service Pack 3) Run as Administrator Command Line Arguments : Modify your shortcut's target to include -direct -txt if you are manually adding files to the data/global/excel plugy 1.14b
PlugY doesn't change the game’s balance or mechanics; instead, it unlocks "Quality of Life" features that were previously restricted to the online Battle.net ladder. Diablo 2 - How to install Plugy for 1.14d!! You cannot use the original PlugY 11