Search for a pre-contained virtual machine (VMware image) of ISTA. Many forum members share ready-to-run VM files. Download that, install VMware Player, and you bypass 90% of the installation headaches.
The "ISTA downloads" you find on torrent sites, forums (e.g., MHH Auto, Digital Kaos), or file lockers are . Downloading them is technically software piracy. However, the BMW community has a long history of "backup" preservation for older vehicles (E-series chassis) where BMW no longer offers official support. Bmw Ista - Download
Using a cracked version for diagnostics on your personal 2008 335i is generally tolerated by BMW (they rarely pursue individuals). Using it in a commercial shop without a license is illegal and unethical. Search for a pre-contained virtual machine (VMware image)
The download process is tedious. The installation is fragile. The interface looks like it was designed in 2010 (because it was). But once you have ISTA running on a dedicated shop laptop, you will never pay a dealer $300 for a "diagnostic fee" again. The "ISTA downloads" you find on torrent sites, forums (e