Fails to install due to I/O error

[d4nirod]

Paw Version 3.1.10 (Retail) 
Build 10DD3D (3001010001) 
Document Model AA921A

Tried to install from https://paw.cloud/extensions/HARImporter > [Install Extension]

Paw app briefliy displays "loading extension info" or something like that and then errors out with message: "The operation couldn't be completed. Input/output error"

• Repeated with the "extensions javascript console" enabled but nothing shows up there.
• Closed and reopened app... same error.
• Tried with "Install extension by identifier" from app preferences with id com.luckymarmot.PawExtensions.HARImporter... same error.

Extensions directory at

/Users/XXXX/Library/Containers/com.luckymarmot.Paw/Data/Library/Application Support/com.luckymarmot.Paw/Extensions

is empty.