SolidWorks does not offer a permanently free "Premium" version for general use, but there are legitimate ways to access the software at no or low cost:
If you have a valid serial number, you can obtain SolidWorks 2018 SP5 through these standard methods: Posts tagged SolidWorks Premium 2018 SP5 Free D...
: SolidWorks 2018 SP5 is notable for providing "Previous Release Interoperability," allowing it to open parts and assemblies created in SolidWorks 2019 with limited functionality. Legal "Free" Options SolidWorks does not offer a permanently free "Premium"
: You can check for updates manually within the software by clicking Help > Check for Updates . Posts tagged SolidWorks Premium 2018 SP5 Free D...
: You can sometimes request a temporary trial through an authorized reseller to test the Premium features. Security Warning SOLIDWORKS Downloads