The update is available from here:

Proton Compiler 3.5.8.1 and 1.0.3.3

Additions and Fixes made in version 3.5.8.1 of the Proton Compiler and version 1.0.3.3 of the Proton24 compiler

Proton Fixes
Adjusted unsigned variable assignment into a signed variable. i.e. SWord = Byte. It no longer sign extends the operand.
Corrected Signed > comparison with a signed word variable and a constant.
Corrected, and optimised, Right Shift of a word variable and dword variable with a constant shift amount value.

Proton Additions
Added support for devices 16F1574, 16F1575, 16F1578, 16F1579, 16LF1574, 16LF1575, 16LF1578, 16LF1579.
Also added support for these unusual 8-bit devices: MCP19110, MCP19111, MCP19114, MCP19115, MCP19117, MCP19118 and MCP19119. These are standard 14-bit PICs but have dedicated high current PWM capabilities.
Added several devices that do not require the USB key. All the free 8-bit devices are now: 18F25K20, 18F25K22, 18F45K20, 18F45K22, 18F26K20, 18F26K22, 18F46K20, 18F46K22, 18F452, 16F877, and 16F877A
Added the text Hints as well as Reminders in the declare: Declare Hints = On or Off. to remove hint texts after a compile.

Proton24 Additions
Added an extra device that does not require the USB key. The free 16-bit devices are now: PIC24EP128MC202, PIC24FJ64GA002, PIC24FJ64GA004, PIC24HJ128GP502, and dsPIC33FJ128GP802
Added the text Hints as well as Reminders in the declare: Declare Hints = On or Off. to remove hint texts after a compile.