Hello, Pilot! Please, write to our Support Centre, we will help you with this issue: arena.support@plarium.com

Hi I download the PC version and all my savings and purchases  ar on Apple ID and Facebook they are not showing in  plarium Please help

Yeah, so far Facebook login doesn't work.  There needs to be a merge between old Mech Arena accounts and Plarium.

^^^ that guy here... I had to create a new Plarium account tied to a different email address.

I messaged customer support and here are the instructions they gave me:

If you run Mech Arena on PC or Mac without first connecting your mobile account to a Plarium ID, Plarium Play will create a new Mech Arena account and will not keep your current progress on the desktop.

If your mobile account wasn't connected to a Plarium ID, please follow these steps:
1. Connect your mobile account to a Plarium ID in the Connection tab. Try the email address that you haven't used before.
2. On your PC, sign out of your current account: Tap the profile picture in the bottom left corner of the Plarium Play window > Sign out.
3. Sign in with the email and password you used to connect your mobile account. 

If you still happen to face any difficulties linking your mobile and PC accounts please contact our agents via this link: https://plrm.me/arena_support or email them at: arena.support@plarium.com. They will be happy to help you!