This thread discusses the article:

CBSubs GPL 4.0 Stable released

Change log:

Bugs:

5321 In admin, plan URLs were displaying old URLs with &task=, instead of new URLs with view=
5315 Mandatory invoice address causes basket to spoofcheck-fail
5289 CBSubs 2.0.0-rc.2 calendar date issue on renewal
5269 On invoice pop-ups, long invoice addresses overlapping invoice number, because number was missing clear:both css
5231 [in RC2 and master]: in Mailer cron-jobs automation settings at top: "Missing private xml method ajaxversioncheck"
5225 Since CBSubs 4.0 RC2: Mailer items not being picked up at correct times (UTC/timezone issue)
5187 2checkout xml response handling does not work correctly
5173 Fix CSS in backend (remove Ahawow-specific CSS that is now implemented in CB 2.0)
5152 Presentation automatic and manual renewal email params do not save
5151 History quicksearch does not work
5082 Promotion with price-display overrides do not show the price with upgrade pro-rating
5069 With newer Ogone account, payments result in "The SHA-OUT signature is incorrect. Please contact site administrator to check error log."
5066 Multiple automatic promotions not displaying correct discounted price
5057 CBSubs module trying to load legacy config file
5054 Manual front-end invoice payment date is logged wrong
5053 In Authorize.net, Dummy and PayPal Pro payment gateways, invoice first and last name may be overwritten by the credit-card holder name (which should be stored separately as payer_name)
5052 Initial first_name and last_name of a payment basket is always taken from CB name, independently of the global setting in Display - Invoices - Name
5044 CBSubs Mailer substitutions not functioning
5034 Promotion dependant on business-status not applied correctly unless invoicing address is updated twice or page refresh is done
5022 By URL Part protection does not work with SEF
5012 Fix issues related with people that upgraded to CBSubs 4.0 RC1
4996 Subscription filtering does not function
4995 4.0.0-rc1: Promotions not working at all
4988 Tax not showing in new sign-up invoice unless address is updated
4985 Totalizers not recalculating on invoice address change
4982 CBSubs Promotions: Copying a promotion causes fatal SQL error
4974 Clicking refund causes missing property notice
4779 CBSubs missing _form_cbsubs_plans
4770 Invoice page gives ERROR: fromxpathnode does not match /cbxml/editinvoiceintegration/*
4769 On J3.3 with site debug on only: Publishing joomlaplugin_cbpaidsubsbot-4.0.0-rc.1 leads to 0 Serialization of 'Closure' is not allowed
4768 CBSubs 4.0.0 rc1 language plugin shows incompatibility icon when installed on CB 2.0
4724 3 month and 2 weeks bonus period not working but 4 month one is working
4720 Backend subscriptions tab doesn't handle redisplay
4716 CBSubs User Management table integration broken with CB 2.0
4635 Fatal error when VAT VIES server is down
4630 PayPal Pro cardtypes contains uppercase values when should be lowercase
4621 Remove whitespaces in VAT number before submitting to EU VIES
4508 EU Taxes: No Warning should display when user entered a company name but no VAT ID
4476 Invoice address has duplicate state option values
4452 Authorize.net: ARB not functional with anything other than USD
4420 Paying basket in backend and using the apply button causes warning
4399 Make clear in paypal setting that encryption is not needed
4315 Plans expiring without an active session (during login attempt, but blocked) results in notice thrown when usergroup change is done
4292 Rounding issue if changing currency after applying a discount
4274 CBSubs Mailer: Subject and Body are not translating language strings
4247 This calendar month day calculations off
4200 Dynamic conditionals for not selected plans and fields using wrong parameters
4199 CB 1.10.0 jQuery compatibility issues
4198 Donation and merchandise plans not displaying in dynamic conditionals selectors
4168 folder access protection not working properly
4065 CBSubs Fields field value removal not working properly
4040 CIC notif.php not working properly after include of index
3978 onCPayAfterDisplayProductPeriodPrice trigger doesn't always send plan object
3975 Chosen plan combination error doesn't translate
3956 Module not detecting CBSubs 3.0.0
3896 Count of cbpaidErrorHandler::uninstall() incorrect in CBSubs module, generating Warning: set_error_handler() expects the argument () to be a valid callback in libraries/cbpaidErrorHandler.php on line 44
3889 authTab only establishes _cbsfp_params once in fields tabs protection
3881 J3.0: CBSubs Content By Menu and By URL Part broken with SEF
3855 Cosmetic fix for anti-file-inclusion defined statements for automated verification
3851 VM integration broken with VM 2.0.16
3838 language typo in Mailer
3812 Secondary currency causes white page when no exchange rate is present
3808 Language strings not working
3755 Timezones in database seams inconsistent with UTC on 2.5+
3734 Renewal calculations for this calendar year not using UTC
3673 Order form: Ajax call for change-currency button should block payment buttons during page refresh
3630 Renewal date wrong when using calendar year duration
3615 New usergroups not applying from subscriptions if the new user registration group is anything other then Registered
3319 CBSubs and CB Privacy issue Investigation
2961 Plans with admin approval do not send emails if plan is not free
2878 Potential bugs reported on forums to check by Beat
2699 J1.5 only: editor/author/publisher content access: NEW link not functioning
2637 emails sent in administrators language and not users
2460 Stats: filters "payment using" and "payment type" dropdowns are empty
2172 giving author permissions is not functional
2099 Ogone payment gateway : Signup-form
2006 CBSubs tab-field protect plugin causes CB Privacy plugin to fail
1679 user given author/publisher rights while registered results in unpublished articles not accessible
1416 Backend: access protection by Component results in 500 error on navigation to protected component without access
1391 Displayed renewal dates in buttons show wrong period, starting at expiration date instead of depending upon renewal_start setting (was: Renew Year 2009 in 2010)
1302 New and Edit icons for author/editor/publisher not showing if no article present in category

Features:

5220 Remove PHP4 compatibility (object references where possible)
5190 Allow identical name for different mailers and tax rules (remove unique constraint on name indexes)
5189 CB Content now protects only frontend, as Joomla 3.x has ACL for administrator side
5184 Use CB Yes/No ans Save/Apply/Cancel/Close stylings in CBSubs backend
5158 Implement different bonus time for re-activation of expired calendar-based subscriptions
5090 Access not authorized text color misleading: Should be green/blue type "message" and not red "warning"
5051 Allow identical name for different promotions (remove unique constraint)
5016 Store GeoIP Country location with Order Basket and use it as default country for invoicing address
5010 deprecate docman integration
4393 Thanks to Joomla ACL following integrations not needed anymore: Deprecated: AlphaUserPoints, EventList, JAwards, Remository and Virtuemart
3969 Promotion conditions should allow not only user-subscriptions plan types but also merchandises and donations
3907 Gateway 2Checkout: Add secondary E-commerce IPN proxy URL handler
3716 Better coupon code usage denied messages
3349 Gateway 2Checkout: Add In-application refunds

Manual works fine here. It's 26.9 MB so it could take a bit of time. My guess is you tried opening it before it finished downloading or the download was interrupted. Maybe try re-downloading?