Before downloading, ensure your system meets these minimum requirements to avoid performance issues: Windows 7 SP1 or newer (32-bit version). CPU: x86 architecture with SSE2 instruction set support.
While 1GB is the bare minimum, 4GB of RAM is strongly recommended to handle the Unity Editor and an IDE like MonoDevelop simultaneously. Graphics: DX10 (Shader Model 4.0) capable GPU. Important Tips for 32-Bit Users Unity download archive Unity 3d 32 Bit Download Free
Go to the official Unity Download Archive . Before downloading, ensure your system meets these minimum
Unity officially discontinued 32-bit support for its editor starting with the release of Unity 2017. To run the editor on a 32-bit Windows machine, you need to download a version from the series or earlier. Unity 3d 32 Bit Download Free