Installing OptiCraft on Windows 7 is slightly different than on Windows 10/11 due to security protocols.
OptiFine is donation-ware. You can download the full version with no time limits, no watermarks, and all features unlocked without paying. The "$10 OptiFine" you see online is a scam. opticraft minecraft windows 7 free
However, if you want to support the developer (sp614x), you can donate via Patreon, but it is 100% optional. Your Windows 7 copy will never "expire." Installing OptiCraft on Windows 7 is slightly different
Fix: Windows 7 often fails to associate .jar files correctly. you can donate via Patreon