You can use the Workspace One Applicance 20.01 who's the latest version with Horizon 8 but you need to download the 19.03.1 connector in order to get access to virtual application .
Note , once you have installed WS1Access choose "Legacy Connector" to be sure that you can deploy the 19.03.1. You can't have at the same time a 19.03.1 (legacy) and 20.01 connector.
BR
Eric