No drivers directly required to make the K350 function, use setpoint that is available on Logitech's website for the additional key function.
SetPoint Mouse & Keyboard Driver
File: SetPoint6.70.55_64.exe
77d4f313f4112bbb6d414804d71810af918ab4ef71f55dabc2007b4086cb7bde
SetPoint Mouse & Keyboard Driver
File: SetPoint6.90.66_32.exe
06b3c8bedec10a246fdfe5e316b86fce5bd88ea1be72eb1260f1e7d2c15641ca
SetPoint Mouse & Keyboard Driver
File: SetPoint6.70.55_64.exe
SetPoint Mouse & Keyboard Driver
File: SetPoint6.70.55_32.exe
6692518b9443284e661f824465b1fe35b096411cf98f22d60b6ae6441e041871
SetPoint Mouse & Keyboard Driver
File: SetPoint6.67.83_32.exe
1e60a1b0b302ad3b116b29dfe736fceecf4da21d4ff9cf0288e86eb14fa79210
SetPoint Mouse & Keyboard Driver
File: SetPoint6.67.82_32.exe
9f1a110772c624e4690d7ebdb0a5f1228abcefcee84643340477b78ea84e1f8a
SetPoint Mouse & Keyboard Driver
File: SetPoint6.67.82_64.exe
7fe24ab247c39f46e849bade8df491d2cae172dd806e7064ed09905f31b9359d