You can check latestchange log of free version at here:
Version 2.4.2
Added: Support for Portuguese (Brazil).
Added: CSS for RTL support.
Version 2.4.1
Fixed: Minor bug fixes.
Version 2.4
Improved: Rewrite overall JS code.
Added: AI translation button inside popup.
Tweak: Minor Textual changes.
Version 2.3.3
Tweak: Minor Textual changes.
Version 2.3.2
Improved: Tested upto WP version 6.2.
Tweak: Minor Textual changes.
Fixed: minor bug fixes.
Version 2.3.1
Fixed: scripts not loading in another language
Version 2.3
Improved: Overall Code improvements.
Removed: No need to activate the free version with PRO anymore.
Fixed: Large string translation merge bug.
Version 2.2.3
Fixed: License notice issue
Version 2.2.2
Fixed: Minor ID bug fixes
Version 2.2
Added: Updated Yandex new translation API
Fixed: unable to translate issue with Yandex
Improved: tested upto WordPress 5.7
Version 2.1.3
Fixed:
- Compatibility issues with WordPress 5.6
- Unable to save string issue with WordPress 5.6 version
Version 2.1.2
Fixed: Compatibility issues with Loco Translate 2.4.6
Version 2.1.1
Fixed: Compatibility issues with Loco Translate 2.4.4
Version 2.1
Added:
- Integrated new Auto Translation
- Added support for Loco Translate Latest version
Fixed:
Compatibility issues with Loco Translate
Improved:
- Removed Extra Code
- Improved custom.js
Version 2.0.1
Notice Added: Addon is currently compatible with only Loco Translate official plugin version 2.4.0, the new compatible update will be available soon.
Version 2.0
Improved:
- Addon is now compatible with only Loco Translate version 2.4.0
- Code improvements
Added: Yandex Page Translate Widget (unlimited translations without API)
Removed:
- API settings panel (now you can use the plugin without the API key)
- IBM Watson translator support
- Loco Translate Older version notices
- Test API settings
- All APIs
Updated: Major JS changes
Version 1.9.1
Fixed: Minor notice change
Version 1.9
Fixed:
- 404 not found bug with IBM translate.
- Unable to disable review notice bug.
Updated: Updated settings panel and translate popup content.
Removed: HTML string translation support.
Added: Added some checks in strings.
Improved:
- Improved IBM translation process.
- Improved: Minor JS improvements.
Version 1.8
Added:
- IBM Watson Translator API support.
- Notice! Yandex Translate API v1 is deprecated.
Fixed: Bug fixes.
Improved:
- Endpoint updates.
- Code improvements.
Version 1.7.5
Fixed: Notice bug fixed.
Updated: Minor settings updates.
Version 1.7.3
Updates: Minor textual changes.
Version 1.7.1
Fixed: Index per request not working issue.
Updated: Updated new logo and all assets.
Version 1.7
Added:
- Chinese languages support.
- Supported singular and plural string translation.
- Added admin notices.
- Added support for the major language.
- Added Punjabi, Kannada, Irish, and Malayalam language support in Microsoft Translator.
Fixed:
- % s and s % space after special characters problem.
- Wrong index updates with multiple strings.
Improved:
- Improved string translation.
- Overall code improvements.
- Optimized settings panel.
Updated: Textual changes.
Version 1.6
Added:
1. Integrated Microsoft Translation API support.
2. Plain text translation support %s,%d placeholders.
3. Integrated API testing button in the settings panel.
4. Added error handling messages.
5. Integrated sweet alert popup.
6. Supported %s,%d placeholder strings in Google Translate.
7. Microsoft translation settings.
Improved: Review notice and updated wrong spelling.
Version 1.5
Added:
- Integrated Google Translation API support.
- Integrated reset translation strings button.
- Integrated characters available characters limit in translation popup.
- Google API settings in the settings panel.
- Norwegian language support.
Improved:
- Translation popup.
- Code Improvements.
- Deactivation popup.
- Textual changes.
Fixed: Minor bugs.
Version 1.4.1
Fixed: Minor JS bug fixes.
Version 1.4
Added:
- Integrated HTML string translation feature.
- Supported Norwegian and other missing languages.
- Integrated translation settings popup.
Improved:
- Optimized code.
- Updated preloader.
Fixed:
- Unsaved string highlighting the issue.
- minor JS issues.
- Wrong characters calculation bug.
Version 1.3.2
Added:
- Integrated URL and link filters in string.
- Added string filters.
Improved:
- JS code.
- Feedback from.
Fixed: Minor issues.
Version 1.3
Added:
- Integrated translated characters stats tables.
- Extend characters limit with premium license key.
- Integrated namespace.
- Not interested button in review popup.
- Integrated premium license key manager.
- Added security checks in every request.
- Integrated nonce in ajax request.
- Improved: Improved translation issues.
Improved:
- Improved overall code.
- Added new screenshots.
Fixed:
- Minor translation issues.
- Minor JS errors.
- Compatibility issues with WordPress 5.3
Version 1.2.1
Fixed: Instant review popup notification bug fixed.
Version 1.2
Fixed:
- Mismatch translation strings in Turkish.
- Minor JS issues.
Improved: Minor textual changes.
Added: Feedback on plugin deactivation.
Version 1.1
Added:
- Integrated automatic translation progress bar popup
- Batch translation of all untranslated words in a single click.
Fixed:
- Issue with HTML translation.
- Minor javascript issues.
Version 1.0.2
Fixed: Translations issues with the Chinese language.
Version 1.0
New: Initial plugin release.