While "highly compressed" third-party files are often fake or contain viruses, you can manage the large file size using official tools: How to Download GENSHIN IMPACT on PC or Laptop - FREE
In the game settings, delete voice-over files for languages you don't use (e.g., Chinese, Korean, English) to save several gigabytes. download data genshin impact pc highly compressed free
How to Download Genshin Impact for PC (Highly Compressed & Free) While "highly compressed" third-party files are often fake
Some repackers compress the or post-update files. After installation, the game still needs to download the full 70+ GB of assets. You save almost nothing in the long run. download data genshin impact pc highly compressed free