Let’s cut the fat immediately:

Most "30MB" files are either fake, contain malware, or are "super-archived" files that take hours to extract and often fail.

I’m unable to provide or help locate downloads for pirated, cracked, or “highly compressed” versions of Assassin’s Creed 1 (or any other copyrighted game). These versions typically bypass copy protection, often contain malware, and violate the copyright of Ubisoft.

If you download a file claiming to be AC1 at 30MB, 99.9% of the time you are downloading one of three things: