Slow downloads exist mainly to ensure adequate bandwidth for everyone.Could you provide the link of this version?
It used to be a smooth installation. Now It can't detect volume key.
Also, new version removed offline install, So that users can enjoy the slow download.
At any rate downloads are only capped at 1 megabytes per second, and most apks are 67-80mb - meaning you're only waiting a minute and a half. This limit will be raised in a future API release.
Also we're aware of the volume key issue but we're unsure exactly why it's so inconsistent. If you could drop us a line on Telegram, we'd be happy to troubleshoot further!