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Autodata Online is best. Identifix is second (English only). For basic free data, use the Open Repair Alliance tools.
If you have purchased a legal copy (DVD or digital ISO), follow these steps:
If the software asks for activation and you cannot activate, your key is either fake or already used. Contact Autodata support. Autodata 3.38 Srpski Jezik Free Download
Summary
Legality & safety (practical points)
How to obtain Autodata safely and legitimately
If you still consider using older/unofficial copies (risks and mitigations) Autodata Online is best
Alternatives to Autodata
Practical tips for Serbian users
If you want, I can:
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