Good day that to buy premium for 1 year, you need to follow these instructions:
1) Go to the BAS store page - https://bablosoft.com/.
2) Select 365 days tariff.
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3) After which a shopping cart button will appear at the top, you need to click and go to the cart
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4) After this, a window appears in which you pay for the purchase, you need to accept the rules and pay for the goods
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Also BAS premium users often buy FingerprintSwitcher , it helps to swap more successfully hardware and browser settings in BAS - you can read more at this link - https://fp.bablosoft.com/#home.
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If there is anything unclear or if you have any other questions feel free to message me in private messages on the forum, I'll be happy to help.