Hi Sam, can you tell us more about this? Which Android OS are you using? But also what did you do before this happens?

Nothings changed, its Flippin annoying, im using the latest android os on my S20, 

Hello @Sam.C can you tell us more details. Are you trying to download the latest Beta or normal version?

Is there enough storage space? Are you using a SD card? 

What is the actual version installed of Deezer?

This could be related to some cache issue on Google Playstore app or corrupted files in your phone.

Check this article here. It has good tips to handle this sort of issues.