PayPal donations are confirmed when PayPal sends an IPN to your site. You should check the IPN log in PayPal to see whether it has been sent to your site.
I'm unable to replicate this issue. Adding a new confirmed donation will grant people any additional user groups.
Post #8 is what I was replying to, so yes I did
XF\Db\Exception: xf_dbtech_donate_donation: MySQL query error [1054]: Unknown column 'length_unit' in 'xf_dbtech_donate_donation' in src/XF/Db/AbstractStatement.php at line 212
XF\Db\AbstractStatement->getException() in src/XF/Db/Mysqli/Statement.php at line 196
XF\Db\Mysqli\Statement->getException() in src/XF/Db/Mysqli/Statement.php at line 77
XF\Db\Mysqli\Statement->execute() in src/XF/Db/AbstractAdapter.php at line 79
XF\Db\AbstractAdapter->query() in src/XF/Db/Schema/AbstractDdl.php at line 151
XF\Db\Schema\AbstractDdl->apply() in src/XF/Db/SchemaManager.php at line 149
XF\Db\SchemaManager->alterTable() in src/addons/DBTech/Donate/Setup.php at line 493
DBTech\Donate\Setup->upgrade903010056Step1() in src/XF/AddOn/StepRunnerUpgradeTrait.php at line 122
DBTech\Donate\Setup->upgradeStepRunner() in src/XF/AddOn/StepRunnerUpgradeTrait.php at line 71
DBTech\Donate\Setup->upgrade() in src/XF/Admin/Controller/AddOn.php at line 452
XF\Admin\Controller\AddOn->actionUpgrade() in src/addons/ThemeHouse/InstallAndUpgrade/XF/Admin/Controller/AddOn.php at line 67
ThemeHouse\InstallAndUpgrade\XF\Admin\Controller\AddOn->actionUpgrade() in src/XF/Mvc/Dispatcher.php at line 249
XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 88
XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 41
XF\Mvc\Dispatcher->run() in src/XF/App.php at line 1934
XF\App->run() in src/XF.php at line 333
XF::runApp() in admin.php at line 13
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