Many different GPT sites have these, but some of them do also contain viruses so I'd recommend using something like Sandboxie or Shadow Defender to protect your machine from anything that might be contained in the downloads.
You can get paid for downloading game (and sometimes other) apps on your smartphone if you have one from InstaGC (and other sites, but InstaGC seems to pay the most from what I've seen). I'm not sure if that's exactly what you're looking for though. But if you go to TrialPay there and look through the apps there you should get something you can do.
There's several other games that you can get paid to play on Facebook too. Get to certain levels and they pay you $2. They can be quite fun sometimes. They can also be time consuming though, but it's handy getting paid to play a game for sure. I'm not sure how international those types of offers are, but I know they're available to countries like US, UK, CA, AUS and I have a friend in Finland that was able to do them.
The same friend was able to use FeaturePoints to download apps and get paid. I'm not sure if it's an app that's available where you are though.