Hi @jslatten,
Actually, GW:1.24 is the latest for LimeSDR-Mini board. You do not have to update it.
Regarding programming failure. It looks like the software can not read the file. Permission issues?
Could you try to update it manually, please. Just download LimeSDR-Mini_HW_1.1_r1.24.rpd file from here: http://downloads.myriadrf.org/project/limesuite/18.03/
Next, choose Programming from Modules menu in LimeSuiteGUI. Select “FPGA FLASH” in Device drop-down box. Open the file you just downloaded and try to Program it.