Error when importing this asset + SoftMaskable not working

[APTEM591]

Describe the bug I have imported this asset to my project but it returns me an error:

Shader error in 'Hidden/UI/Default (SoftMaskable)': Couldn't open include file 'Packages/com.coffee.softmask-for-ugui/Shaders/SoftMask.cginc'. at line 58

Compiling Subshader: 0, Pass: Default, Vertex program with SOFTMASK_EDITOR Platform defines: SHADER_API_MOBILE UNITY_COLORSPACE_GAMMA UNITY_ENABLE_REFLECTION_BUFFERS UNITY_HARDWARE_TIER3 UNITY_LIGHTMAP_DLDR_ENCODING UNITY_NO_CUBEMAP_ARRAY UNITY_NO_DXT5nm UNITY_NO_RGBM UNITY_NO_SCREENSPACE_SHADOWS UNITY_PBS_USE_BRDF2 Disabled keywords: SHADER_API_GLES30 UNITY_ASTC_NORMALMAP_ENCODING UNITY_ENABLE_DETAIL_NORMALMAP UNITY_ENABLE_NATIVE_SHADOW_LOOKUPS UNITY_FRAMEBUFFER_FETCH_AVAILABLE UNITY_HALF_PRECISION_FRAGMENT_SHADER_REGISTERS UNITY_HARDWARE_TIER1 UNITY_HARDWARE_TIER2 UNITY_LIGHTMAP_FULL_HDR UNITY_LIGHTMAP_RGBM_ENCODING UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_METAL_SHADOWS_USE_POINT_FILTERING UNITY_NO_FULL_STANDARD_SHADER UNITY_PBS_USE_BRDF1 UNITY_PBS_USE_BRDF3 UNITY_PRETRANSFORM_TO_DISPLAY_ORIENTATION UNITY_SPECCUBE_BLENDING UNITY_SPECCUBE_BOX_PROJECTION UNITY_UI_ALPHACLIP UNITY_UI_CLIP_RECT UNITY_UNIFIED_SHADER_PRECISION_MODEL UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS UNITY_VIRTUAL_TEXTURING

Screenshots

Environment (please complete the following information):

• Version 1.0.2
• Platform: Editor(Windows)
• Unity version: 2021.3.14f1
• Build options: IL2CPP

[APTEM591]

Wrong installation. My bad.