Kdan PDF SDK System Requirement iOS iOS 9.0 or higher Xcode 9.0 or newer for Objective-C Android Android 4.x or newer 32/64-bit ARM (armeabi-v7a/arm64-v8a) or 32-bit Intel x86 CPU Windows Windows 10 Have more questions? Submit a request 1 Comments Date Votes 0 daniel May 06, 2019 21:35 Bad customer support. no help or faqs and the knowlewdge base area is very poor. i tried to upgrade the free pdf reader to 365 ( paid $49.99 usd) however the upgrade did not happen. they took my money and provided no communications on how the upgrade process was meant to happen. sent 2 different emails no response yet except the standard automated response "We have received your email, and we will try our best to get back to you within the next three working days. In the meantime, please refer to our help center, if you have any difficulties while using our apps" stay away from this product or company. DANIEL, AUSTRALIA. Please sign in to leave a comment.