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I know you said on "mobile web" but I just wanted to point out that Google Analytics can track install campaigns on both Android and iOS without dubious fingerprinting techniques, they just use IDFA/AdvertisingId to do so and is free to use.

The only drawback is that in iOS you can only track campaigns done through mobile in-app ads. No attribution for email campaigns, or mobile web campaigns.

Correct, the problem I was facing prior to this announcement is specific to mobile web (i.e. open download link from browser)

It's not too hard to accurately fingerprint source of downloads/conversions. Refer: https://github.com/jkotchoff/adwords_conversion_tracking_tit...

Just a plug because I built it, but branch.io gives this service away for free. We open all the 'black-box' fingerprinting parameters (like match duration) for you to tune as well.