Hey, so i accidentally installed EUP L&O into the games directory instead of the mods folder, is there any way i can remove it without reinstalling GTA5 completely.

Yes. Verify your game files.

 

For the Retail version of GTA V: Open the Rockstar Games launcher -> Locate "Settings" in the top right corner -> Select under "My Installed Games" Grand Theft Auto 5 -> Select Verify Integrity.

For the Steam version of GTA V: Right click Grand Theft Auto V in Steam -> Properties -> Local Files -> Verify Integrity Of Game Cache.

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?xml version="1.0" encoding="UTF-8"?>
<package version="2.0" id="{64DE0490-6A4B-468E-B963-4B7DB6223FAA}" target="Five">
    <metadata>
        <name>EUP: Law &amp; Order 8.1</name>
        <version>
            <major>8</major>
            <minor>1</minor>
        </version>
        <author>
            <displayName>EUP Team</displayName>
            <actionLink>http://www.lcpdfr.com/files/file/8151-emergency-uniforms-pack/</actionLink>
            <web>http://www.lcpdfr.com/files/file/8151-emergency-uniforms-pack/</web>
        </author>
        <description footerLink="http://www.lcpdfr.com/files/file/8151-emergency-uniforms-pack/" footerLinkTitle="More"><![CDATA[This package will automatically remove previous versions of EUP. If you would like to keep previous content, please make the appropriate backups now!
        
        EUP - Law & Order is an all-in-one modification that gives you the free range to create your own law enforcement officer as you patrol the streets and roads of San Andreas. U mad Ronson?

        Made by EUP Team: Alex_Ashfold, PieRGud, Yard1, Alex Braun, Alex Von Shep, Netman, Nailbiter
        Special thanks to PNWParksFan, Dilapidated and alexguirre for their contributions!]]></description>
        <largeDescription displayName="Description" footerLink="http://www.lcpdfr.com/files/file/8151-emergency-uniforms-pack/" footerLinkTitle="More"><![CDATA[This time play different - be different. Adapt your style to the situation. Get your gear on - use a High-Vis vest to direct traffic, a waterproof jacket on a rainy day or a tactical outfit when the situation gets hot. Choose from various departments (lore-friendly). Customize various components of your outfits.

        Need support? Check out the LCPDFR.com topic - http://www.lcpdfr.com/forums/topic/58729-emergency-uniforms-pack-support/
        
        Did you know EUP has its own Discord? Come join us! - https://discord.gg/aTQfepT

        Changelog:
- Removed old flippers model
- Fixed BCSO k-9 vest textures for female
- Fixed some UV Maps on a belt
- Fixed GoPostal preset outfits for females in EUP Menu
- Fixed a minor clipping with female turtleneck shirt with warmcoat
- Added underjacket shirts for SAHP CVE
- Added Brown variant of BCSO as a vintage option
- Removed some useless textures placeholder in sup archive
- Added a Civilian Ushanka hat version (no badge)
- Added sergeant variation for LSPD Belt badge
- Fixed a TYPO on the female LSPD Belt badge
        
]]></largeDescription>
    </metadata>

    <colors>
        <headerBackground useBlackTextColor="False">$FF003A5E</headerBackground>
        <iconBackground>$00000000</iconBackground>
    </colors>

    <content>
        <archive path="update\update.rpf" createIfNotExist="False" type="RPF7">                
            <delete>dlc_patch\mpimportexport\content.xml</delete>
            <delete>dlc_patch\mpimportexport\setup2.xml</delete>
            <delete>x64\eup\script_txds.rpf</delete>
            <delete>x64\eup\eup_componentpeds_p.rpf</delete>
            <delete>x64\eup\eup_componentpeds.rpf</delete>
            
            <text path="common\data\dlclist.xml" createIfNotExist="False">
                <delete condition="Mask">*\eup\*</delete>
                <delete condition="Mask">*\eupme\*</delete>
                <delete condition="Mask">*\euptactical\*</delete>
                <delete condition="Mask">*\euprescue\*</delete>
                <delete condition="Mask">*\sup\*</delete>
                <delete condition="Mask">*/eup/*</delete>
                <delete condition="Mask">*/eupme/*</delete>
                <delete condition="Mask">*/euptactical/*</delete>
                <delete condition="Mask">*/euprescue/*</delete>
                <delete condition="Mask">*/sup/*</delete>
                <insert where="Before" line="*&lt;/Paths&gt;*" condition="Mask">        &lt;Item&gt;dlcpacks:/eup/&lt;/Item&gt;</insert>
            </text>    
        </archive>
        
        <archive path="update\x64\dlcpacks\eup\dlc.rpf" createIfNotExist="True" type="RPF7">
            <add source="content.xml">content.xml</add>
            <add source="setup2.xml">setup2.xml</add>
            <add source="x64\eup_componentpeds.rpf">x64\eup_componentpeds.rpf</add>
            <add source="x64\eup_componentpeds_p.rpf">x64\eup_componentpeds_p.rpf</add>
            <add source="x64\script_txds.rpf">x64\script_txds.rpf</add>
        </archive>
    </content>
</package>

 

^ this shows where each EUP L&O file has been installed to ^

Simpley navigate there using OPENiv and remove the files.