I have the same issue here about creating a wallet in order to generate an address to receive the reward in DAG. In the released clients for DAG, no available wallets for windows 8.1 (all the releases are for windows 10) so i thought to create an account on Kucoin so i can use the DAG deposit address.
Have you check this gentle man step on how to create molly wallet on 8.1? This should help perhaps.
I installed Molly wallet on windows 8.1. Installation stuck every time at first step "installing Java" so I have decided to help him. I download jre-8u261-windows-x64.exe and install it manually, then Molly wallet has been installed successfully.
The issue here is i can't confirm that this address will be reserved for all the deposits that i may make in DAG.
What i mean, if i generate an address from Kucoin today and add it to my account on bounty0x, should i still be able to receive my reward weeks later when the team send my reward? Is that deposit address available for all future deposits? Isn't limited for a certain period?
I dnt know much about molly wallet future update but I haven't seen a wallet update that has a change of public address. They always remain intact, so receiving your funds through kucoin shouldn't be a problem.
The only major issue with exchange wallet, they take time when it comes to wallet updates for their users, why not try installing again by following that gentle man steps.