Here are the minimum specifications for Gloomhaven:

Requires a 64-bit processor and operating system
OS: Win 10 64bits
Processor: Intel Core i5-3470, AMD Ryzen 3 1200, or above
Memory: 8 GB RAM
Graphics: GeForce GTX 760, Radeon R9 280, or above
DirectX: Version 11
Storage: 10 GB available space