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BMCLAPI地址： https://bmclapi2.bangbang93.com/optifine/1.12.2/HD_U_G5/pre1 该版本下载下来的文件只有14KB，打开时提示文件已损坏，使用HMCL自动安装选择该版本也会提示文件损坏。
该版本的官方地址：https://optifine.net/adloadx?f=preview_OptiFine_1.12.2_HD_U_G5_pre1.jar&x=3b52 官方下载的文件大小是2607KB
optifine又改网页了，现在应该正常了