[Tween73]

Windows 10 64 bit.

Loading plugin: libRegEx.dll Failed.

[Sew_Sumi]

Likely to be missing a runtime, you could install all runtimes to try and fix it, but from the look, that plugin is so old that you'll have trouble getting support for it.

[Tween73]

----------
Loaded log file: "server_log.txt".
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SA-MP Dedicated Server
----------------------
v0.3.7-R2, ©2005-2015 SA-MP Team

[08:13:33]
[08:13:33] Server Plugins
[08:13:33] --------------
[08:13:33] Loading plugin: sscanf
[08:13:33]

[08:13:33] ===============================

[08:13:33] sscanf plugin loaded.

[08:13:33] Version: 2.8.1

[08:13:33] © 2012 Alex "******" Cole

[08:13:33] ===============================

[08:13:33] Loaded.
[08:13:33] Loading plugin: Whirlpool
[08:13:33]
[08:13:33] ==================
[08:13:33]
[08:13:33] Whirlpool loaded
[08:13:33]
[08:13:33] ==================
[08:13:33]
[08:13:33] Loaded.
[08:13:33] Loading plugin: libRegEx
[08:13:33] Failed.
[08:13:33] Loaded 2 plugins.

[08:13:33]
[08:13:33] Filterscripts
[08:13:33] ---------------
[08:13:33] Loading filterscript 'jadmin3.amx'...
[08:13:33] Loaded 1 filterscripts.

[08:13:33] Loaded 3 vehicles from: vehicles/trains.txt
[08:13:33] Loaded 3 vehicles from: vehicles/pilots.txt
[08:13:33] Loaded 15 vehicles from: vehicles/lv_law.txt
[08:13:33] Loaded 39 vehicles from: vehicles/lv_airport.txt
[08:13:33] Loaded 255 vehicles from: vehicles/lv_gen.txt
[08:13:33] Loaded 38 vehicles from: vehicles/sf_law.txt
[08:13:33] Loaded 35 vehicles from: vehicles/sf_airport.txt
[08:13:33] Loaded 353 vehicles from: vehicles/sf_gen.txt
[08:13:33] Loaded 24 vehicles from: vehicles/ls_law.txt
[08:13:33] Loaded 37 vehicles from: vehicles/ls_airport.txt
[08:13:33] Loaded 98 vehicles from: vehicles/ls_gen_inner.txt
[08:13:33] Loaded 389 vehicles from: vehicles/ls_gen_outer.txt
[08:13:33] Loaded 71 vehicles from: vehicles/whetstone.txt
[08:13:33] Loaded 168 vehicles from: vehicles/bone.txt
[08:13:33] Loaded 61 vehicles from: vehicles/flint.txt
[08:13:33] Loaded 96 vehicles from: vehicles/tierra.txt
[08:13:33] Loaded 96 vehicles from: vehicles/red_county.txt
[08:13:33] Total vehicles from files: 1781
[08:13:33]
---------------------------------------
[08:13:33] Running Grand Larceny - by the SA-MP team

[08:13:33] ---------------------------------------

[08:13:33] Number of vehicle models: 173
[08:13:34] --- Server Shutting Down.

[Sew_Sumi]

As I said, it's likely you are missing the runtimes required for regexlib... There are none listed on the release thread, and the plugin is so old you'll be hard pushed to find support for it.