This has been going on for some time now (specifically, since the installer began being packaged within .zip files).  The .zip files themselves are named consistently, but the installer executables are not -- sometimes they contain spaces after the words "EVGA" and "Precision", other times underscores.
 
There also seems to be inconsistencies when it comes to version numbering.  For some reason, sometimes the releases are named x.y.z while other ones are named x.y.z.0.  This has been going on for some time.
 
I suspect EVGA has more than 1 employee doing the final release builds, and each employee has a different way/choice of naming the installer executables/versions.  All this does is create a degree of confusion for end users.
 
Below is evidence of both filename and versioning inconsistency, per a DIR /O:GN (i.e. sorted alphabetically), of all installers going back to 1.0.0.0:
 
2020-10-16 17:37 55,070,010 EVGA Precision X1_1.1.0.11.exe
2020-11-26 16:01 60,677,456 EVGA Precision X1_1.1.2.0.exe
2020-12-14 11:20 60,721,656 EVGA Precision X1_1.1.3.0.exe
2020-12-16 09:58 60,721,888 EVGA Precision X1_1.1.4.0.exe
2021-01-15 17:01 60,931,368 EVGA Precision X1_1.1.5.0.exe
2021-01-21 10:26 60,932,624 EVGA Precision X1_1.1.6.0.exe
2021-02-01 11:12 60,932,624 EVGA Precision X1_1.1.7.0.exe
2021-04-08 17:14 61,692,928 EVGA Precision X1_1.1.9.0.exe
2021-04-09 13:15 49,337,776 EVGA_Precision_X1_1.0.0.0.exe
2021-04-09 13:15 49,360,944 EVGA_Precision_X1_1.0.1.0.exe
2021-04-09 13:15 49,366,512 EVGA_Precision_X1_1.0.2.0.exe
2021-04-09 13:15 49,338,616 EVGA_Precision_X1_1.0.3.0.exe
2021-04-09 13:15 49,341,944 EVGA_Precision_X1_1.0.4.0.exe
2021-04-09 13:15 49,349,872 EVGA_Precision_X1_1.0.6.exe
2021-04-09 13:15 50,544,224 EVGA_Precision_X1_1.0.7.exe
2020-11-06 14:21 58,187,456 EVGA_Precision_X1_1.1.1.exe
2021-03-29 23:51 61,577,472 EVGA_Precision_X1_1.1.8.0.exe