Check out the patch notes for the v20 Lovely Update here:

32-Bit Client Discontinuation

MapleStory 2 Rep: 4,010
Posts: 319
in Official News

Greetings Maplers,

Starting on February 12th, 2020, the 32-bit client for MapleStory 2 will be discontinued. Players will be defaulted to the 64-bit version of the game client. Moreover, the recommended specs of MapleStory 2 will be adjusted on all of our platforms. Due to Microsoft's discontinuation of Windows 7 support, we recommend that players use Windows 10 when playing the game.

Recommended Operating System
Before: Windows 7 64-bit
After: Windows 10 64-bit

Recommended Processor
Before: Intel Core i5 or better
After: Intel Core i5 or better

Recommended Hard Drive Space
Before: 8 GB available space
After: 20 GB available space

Recommended Memory
Before: At least 8 GB RAM
After: At least 8 GB RAM

Recommended Graphics
Before: GeForce GTX 750 / GTX 750 TI/ GTX 650TI / GT 1030 or better
After: GeForce GTX 650 / Radeon 6770 or better

- The MapleStory 2 Team