Can you mod a "Highly Compressed" version?
Yes, but with limits.
Warning: Do not install the "High Resolution Texture Pack" DLC on a highly compressed game. It defeats the purpose and will likely cause memory crashes. i--- Download The Elder Scrolls V Skyrim Highly Compressed
Disclaimer: We do not endorse piracy. The following are historical references for educational purposes only.
If you absolutely insist on a pre-compressed download, the community generally agrees on two reputable repack teams (groups known for quality compression without breaking the game): Can you mod a "Highly Compressed" version
How to spot a FAKE:
First, let’s decode the search term. In the underground world of game repacks and compression, "I---" is often a typographical wildcard or a placeholder. It usually stands for: Warning: Do not install the "High Resolution Texture
Regardless of the syntax, the intent is clear: Users want the full Skyrim experience in a file size that is 50% to 90% smaller than the original.
Result: You can shrink Skyrim from 15GB to roughly 9GB without losing a single frame of performance. It is 100% safe, 100% legal, and you don't risk downloading a bitcoin miner.
Assuming you have downloaded a 6GB setup file from a trusted source, here is the installation ritual: