I was wondering do you support, 0.3.DL version of SA-MP.

Yes it is supported. Just upload files to server and you should be good to go. If you have any issues with it let us know :)

Thanks for the answer, I uploaded the files but when I try to join it says that im running the incorrect version of samp, so do I need to change enything in the server.cfg or something like that?

Could you send contents of your server_log.txt ? Let's see what server version is running first.

Oh, it's running on 0.3.7-R2, what should I do to change it?

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Loaded log file: "server_log.txt".
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SA-MP Dedicated Server
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v0.3.7-R2, (C)2005-2015 SA-MP Team

Change samp03svr file

Am I supposed to download it from somewhere, and if so, where do I get the download link?

https://lemehost.com/market/view?id=116