Where can I download the Infinity Engine?

[Turtle-Gal]

Title

[Ceana of the Crags]

Try this:
https://sourceforge.net/projects/gemrb/

GemRB seems to be what you can get your hands on.

"Infinity Engine is a computer game engine which allows the creation of isometric computer role-playing games. It was developed by BioWare for Battleground Infinity which later became the first installment of the Baldur's Gate series. BioWare used it again in the subsequent installments of the series, but also licensed the engine to Interplay's Black Isle Studios.

Infinity Engine features real-time gameplay with quasi-real-time combat. The engine uses an isometric perspective with pre-rendered 2D backgrounds and sprite-based characters. Although graphically 2D for the most part, BG2 demonstrated that the engine could use OpenGL acceleration for visual effects. Designed for six character party-based adventuring by default, the Infinity Engine was the spiritual successor to the Gold Box Engine, and provided the basis for five Dungeons & Dragons licensed computer role-playing games plus additional expansion packs. It was succeeded by BioWare's Aurora Engine.

A free compatible game engine recreation is in development under the name of GemRB. It runs on multiple platforms, including Linux, Mac OS X and Windows." (https://www.moddb.com/engines/infinity-engine)

This is for Infinity Saved Game Editors: https://sorcerers.net/Games/IEmodding/IESE.php