Cause: SOL 2.1.3 was compiled against OpenSSL 1.1.1, but many modern distros use OpenSSL 3.0.
Fix: Install compatibility layer:
# Ubuntu/Debian
sudo apt install libssl1.1
# CentOS/RHEL
sudo yum install compat-openssl10
While modern development environments (like Remix, Hardhat, or Foundry) default to the latest stable versions, specific legacy versions can still be accessed if required for auditing or porting legacy code. sol 2.1.3 download
The source code for all Solidity releases, including historical versions, is hosted on the official GitHub repository. Cause: SOL 2
Sol 2.1.3 refers to version 2.1.3 of the Solidity programming language. Solidity is a statically-typed, curly-braces programming language designed for developing smart contracts that run on the Ethereum Virtual Machine (EVM). It is the primary language used for Ethereum and EVM-compatible blockchain development. are free. However
A: Yes. All SOL versions, including 2.1.3, are free. However, the developer accepts Patreon donations. Never pay for a SOL 2.1.3 download from a third party.
Version 2.1.3 addresses a critical authentication bypass in the SOL RPC service. Organizations still bound to older infrastructure (e.g., industrial control systems or legacy banking switches) cannot always upgrade to SOL 3.x due to API breaking changes. SOL 2.1.3 offers a backported security fix without altering the public API surface.