Gta 4 - Highly Compressed Pc

Be very careful. Here are somewhat trusted sources (always scan files before running):

If GTA 4 still runs poorly, the highly compressed version of GTA: San Andreas (original, not Definitive) runs on any PC and gives a similar open-world feel. Gta 4 Highly Compressed Pc

Most websites offering "GTA 4 PC highly compressed" are unregulated. Here are common dangers: Be very careful