Only download files from reputable community archives. Avoid sites that require you to download .exe files or "installers" to get the ROM.
Regarding the ROM download, I must remind you that downloading ROMs of games you don't own can be considered piracy and may be against the law in your region. Additionally, downloading ROMs from untrusted sources can pose a risk to your device's security. asphalt 4 elite racing dsi rom download full