If you are a fan of older mods (like ProMods 2.33 or specific paint job packs), v1.32 is the "Goldilocks" version—modern enough to look good, but old enough to run smoothly on low-end PCs and support legacy mods.
Because ETS2 is actively updated (sitting well beyond version 1.50 today), accessing 1.32 requires using the legacy branches via the Steam Store: Download Euro Truck Simulator 2 Version 1.32