itthinx

This plugin redirects 404’s caused by hits on pages that are protected by <a href="https://wordpress.org/plugins/groups/" rel="ugc">Groups</a>.
The redirection settings can be adjusted in Settings > Groups 404 :
Visits to protected pages can be redirected to:
<ul>
<li>a specific post, or</li>
<li>the WordPress login</li>
</ul>
The redirection can also be applied for restricted categories, tags and other taxonomy terms if <a href="https://www.itthinx.com/shop/groups-restrict-categories/" rel="nofollow ugc">Groups Restrict Categories</a> is used.
The redirect status code can be selected among:
<ul>
<li>Moved Permanently (301)</li>
<li>Found (302)</li>
<li>See other (303)</li>
<li>Temporary Redirect (307)</li>
</ul>

Groups 404 Redirect

I know this plugin hasn't been updated in a couple years, but IMHO Groups and its related plugins (like this one) are a hidden gem for WordPress sites. So many people jump to complicated membership plugins when they could do everything they need with Groups. This 404 redirect add-on works like a charm. I'm using it on the latest version of WP 5.x

Perfect.

Redirect 404's when a visitor tries to access a page protected by Groups.

Brainstorm Force

SureMembers turns your WordPress site into a powerful membership platform.
Lock content, build unlimited membership levels, and decide exactly who has access to what. Whether you run a paid membership site, a course platform, or simply want to share content with a select group, SureMembers gives you everything you need to get started.
Set it up in minutes. No complicated configurations. No monthly per-member fees. Everything runs natively on WordPress, under your brand, with your data.
<a href="https://app.zipwp.com/blueprint/suremembers-demo-48o" rel="nofollow ugc">Try the live demo</a> (no signup required).
<h3>Why SureMembers?</h3>
Most membership tools either lock you into expensive monthly plans or require hours of configuration. SureMembers takes a different approach: a clean, focused content restriction solution that works the way you’d expect WordPress to work.
You stay in control of your content, your members, and your business. Pair it with your favorite payment platform like SureCart, and you have a complete membership system running on WordPress.
<h3>What You Can Build</h3>
Membership Sites: Create unlimited membership levels and decide what each level can access.
Paid Courses: Protect lessons and course content based on membership.
Private Content Libraries: Share guides, resources, and downloads with paying members only.
Subscription Communities: Restrict access to community pages, posts, and discussions.
Premium Newsletters: Gate articles and posts behind a membership.
Resource Hubs: Give different access levels to different customer tiers.
<h3>Free Features</h3>
<ul>
<li>Unlimited memberships: create as many access groups as you need</li>
<li>Content protection for posts, pages, and custom post types</li>
<li>Unauthorized access handling with custom redirects</li>
<li>LMS integrations for popular learning platforms</li>
<li>Redirection rules for login, logout, and restricted content</li>
<li>Login customizer to brand your login page</li>
<li>Clean, intuitive admin dashboard</li>
<li>Works with any WordPress theme</li>
<li>Lightweight and fast, no bloat</li>
<li>Mobile-friendly responsive design</li>
<li>Translation-ready</li>
</ul>
<h3>SureMembers Premium</h3>
Take your membership site further with SureMembers Premium:
<ul>
<li>User Role Sync: Automatically sync WordPress user roles with membership access groups</li>
<li>Block-Level Restrictions: Restrict individual blocks within posts and pages</li>
<li>Drip Content: Schedule when members get access to specific content</li>
<li>Downloads Protection: Protect file downloads behind membership levels</li>
<li>Login Restrictions: Control login attempts, session limits, and access rules</li>
<li>Email Templates: Customize member onboarding and notification emails</li>
<li>Import Users via CSV: Bulk import existing users into access groups</li>
<li>Advanced Protected Content: Protect all posts, archives, CPTs, and URL-based content</li>
</ul>
<a href="https://suremembers.com" rel="nofollow ugc">Learn more about SureMembers Premium</a>
<h3>Works Great With</h3>
SureMembers is part of a growing WordPress ecosystem:
<ul>
<li><a href="https://surecart.com/" rel="nofollow ugc">SureCart</a>: Sell memberships, courses, and digital products. SureCart pairs perfectly with SureMembers to power your entire membership business.</li>
<li><a href="https://suredash.com/" rel="nofollow ugc">SureDash</a>: Build a community right inside WordPress with discussion spaces, courses, and member dashboards. Use SureMembers to control access to portals and spaces.</li>
<li><a href="https://wpastra.com/" rel="nofollow ugc">Astra Theme</a>: The most popular WordPress theme, fully compatible with SureMembers.</li>
</ul>
Each plugin works independently, but together they give you a complete membership and community business, all on WordPress.
<h3>Perfect For</h3>
<ul>
<li>Course creators selling online courses</li>
<li>Coaches running paid coaching programs</li>
<li>Bloggers offering premium content</li>
<li>Membership sites with multiple tiers</li>
<li>Communities that need private spaces</li>
<li>Businesses sharing resources with customers</li>
<li>Anyone who wants to control content access on WordPress</li>
</ul>
<h3>Links</h3>
<ul>
<li><a href="https://suremembers.com" rel="nofollow ugc">SureMembers Website</a></li>
<li><a href="https://suremembers.com/docs" rel="nofollow ugc">Documentation</a></li>
<li><a href="https://suremembers.com/support" rel="nofollow ugc">Support</a></li>
</ul>

SureMembers – Membership & Content Restriction Plugin

Protect your content, build memberships, and control who sees what on your WordPress site, without writing a single line of code.

Groups 404 Redirect vs SureMembers – Membership & Content Restriction Plugin