To install simple blocks, click the download button to visit its Steam Workshop page. Then click the green subscribe button to download the mod.
API blocks are more complicated, and I am currently unable to upload them to Steam Workshop. To install API blocks, download the ZIP file and extract its contents. Next, find the game's Mods folder. It is usually located at C:\Program Files (x86)\Steam\steamapps\common\cyubeVR\cyubeVR\Mods. After you've extracted the ZIp file, you should see two folders: API and Blocks. Copy the contents of the API folder and paste them into ...cyubeVR\cyubeVR\Mods\APIMods. Next, copy the contents of the Blocks folder and paste them into ...cyubeVR\cyubeVR\Mods\Blocks.