[werk_ag]

Please not that the your ClosedCube SHT35-D comes by default at address 0x45 and the software is expecting for it to be at address 0x44 (default for almost all SHT3x sensors).

You can try to change the default address in the user configurable settings

Code:

// --------------------------------------------------------------------------------------
//   SHT31 I2C Address - Default address will work most of the times!
// --------------------------------------------------------------------------------------
#define SHT31_address 0x44       // Default value is 0x44, but it can be changed to 0x45

If it still not work, change the address on the ClosedCube module.

I checked the libraries, and there is nothing on them to distinguish between an SHT31 or a SHT35. So the supplied library should work with both.