Did i do something wrong? Is there another way? Or is the RTL8188CUS just not supported by the driver?
Yep, this driver doesn't support RTL8188CUS, since it used the 8192 chipset and it requires 8192cu driver.
The list of supported device IDs by 8188eu:
056E:4008 Elecom Co., Ltd (Device name unknown)
07B8:8179 AboCom Systems Inc (Device name unknown)
0BDA:0179 Realtek Semiconductor Corp. RTL8188ETV Wireless LAN 802.11n Network Adapter
0BDA:8179 Realtek Semiconductor Corp. RTL8188EUS 802.11n Wireless Network Adapter
0DF6:0076 Sitecom Europe B.V. (Device name unknown)
2001:330F D-Link Corp. (Device name unknown)
2001:3310 D-Link Corp. (Device name unknown)
2001:3311 D-Link Corp. (Device name unknown)
-------
PS: It looks like some Chinese wifi dongles use RTL8188FTV chipset, so to ensure compatibility with the scope it'll be better to order the exact RTL8188EUS (RTL8188EU) or RTL8188ETV
Also be careful with TP-Link TL-WN725N which someone advised as compatible, since it has 3 versions... V1 uses RTL8188CUS, and V2/V3 use RTL8188EUS